diff --git a/.eslintignore b/.eslintignore
index 8b7cd1182e6a..09044a7076c3 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -166,22 +166,17 @@ devtools/server/tests/unit/sourcemapped.js
 devtools/server/tests/unit/xpcshell_debugging_script.js
 
 # dom/ exclusions
-dom/abort/**
 dom/animation/**
-dom/asmjscache/**
-dom/battery/**
 dom/base/*.*
 dom/base/test/*.*
 dom/base/test/unit/test_serializers_entities*.js
 dom/base/test/unit_ipc/**
 dom/base/test/jsmodules/**
 dom/bindings/**
-dom/broadcastchannel/**
 dom/browser-element/**
 dom/cache/test/mochitest/**
 dom/cache/test/xpcshell/**
 dom/canvas/**
-dom/console/**
 dom/encoding/**
 dom/events/**
 dom/fetch/**
diff --git a/dom/asmjscache/test/file_slow.js b/dom/asmjscache/test/file_slow.js
index 963422143c35..01917f7a60db 100644
--- a/dom/asmjscache/test/file_slow.js
+++ b/dom/asmjscache/test/file_slow.js
@@ -1,4 +1,4 @@
-function f1() { "use asm"; function g() {} return g }
+function f1() { "use asm"; function g() {} return g; }
 if (this.jsFuns) {
     ok(jsFuns.isAsmJSModule(f1), "f1 is an asm.js module");
     ok(jsFuns.isAsmJSFunction(f1()), "f1.g is an asm.js function");
@@ -10,8 +10,8 @@ function f2(stdlib, foreign, buffer) {
     function main(n) {
         n = n|0;
         var i = 0, sum = 0;
-        for (; (i|0) < (n|0); i=(i+1)|0)
-            sum = (sum + (i32[(i<<2)>>2]|0))|0;
+        for (; (i|0) < (n|0); i=(i + 1)|0)
+            sum = (sum + (i32[(i << 2) >> 2]|0))|0;
         return sum|0;
     }
     return main;
@@ -41,7 +41,7 @@ function f3(stdlib, foreign, buffer) {
     function main() {
         var i = 0, sum = 0;
         while (1) {
-            for (i = 0; (i|0) < 1000; i=(i+1)|0)
+            for (i = 0; (i|0) < 1000; i=(i + 1)|0)
                 sum = (sum + i)|0;
             if (done(sum|0)|0)
                 break;
@@ -58,7 +58,7 @@ function done(sum) {
     lastSum = sum;
     return (Date.now() - begin) > 3000;
 }
-var f3Main = f3(this, {done:done}, i32.buffer);
+var f3Main = f3(this, {done}, i32.buffer);
 if (this.jsFuns)
     ok(jsFuns.isAsmJSFunction(f3Main), "f3.main is an asm.js function");
 
diff --git a/dom/asmjscache/test/test_cachingBasic.html b/dom/asmjscache/test/test_cachingBasic.html
index f491fe9fa2bb..527f3e547d03 100644
--- a/dom/asmjscache/test/test_cachingBasic.html
+++ b/dom/asmjscache/test/test_cachingBasic.html
@@ -30,8 +30,8 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=929236
   ok(code.length > 100000, "code is long enough to definitely hit the cache");
 
   function evalAsync(code) {
-    var blob = new Blob([code], {type:"application/javascript"});
-    var script = document.createElement('script');
+    var blob = new Blob([code], {type: "application/javascript"});
+    var script = document.createElement("script");
     script.src = URL.createObjectURL(blob);
     document.body.appendChild(script);
   }
@@ -44,7 +44,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=929236
         evalAsync(code);
         break;
       case 1:
-        ok(jsFuns.isAsmJSModuleLoadedFromCache(module), 'module loaded from cache');
+        ok(jsFuns.isAsmJSModuleLoadedFromCache(module), "module loaded from cache");
         SimpleTest.finish();
         break;
       default:
diff --git a/dom/asmjscache/test/test_cachingMulti.html b/dom/asmjscache/test/test_cachingMulti.html
index ceaf75812b4a..bee76e0f9062 100644
--- a/dom/asmjscache/test/test_cachingMulti.html
+++ b/dom/asmjscache/test/test_cachingMulti.html
@@ -45,8 +45,8 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=944821
   }
 
   function evalAsync(code) {
-    var blob = new Blob([code], {type:"application/javascript"});
-    var script = document.createElement('script');
+    var blob = new Blob([code], {type: "application/javascript"});
+    var script = document.createElement("script");
     script.src = URL.createObjectURL(blob);
     document.body.appendChild(script);
   }
@@ -55,13 +55,13 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=944821
   function finishedEvalAsync() {
     finishedCount++;
 
-    if (finishedCount < 1 || finishedCount > 2*N) {
+    if (finishedCount < 1 || finishedCount > 2 * N) {
       throw "Huh?!";
     } else if (finishedCount == N) {
       assertCacheHit = true;
       for (var i = 0; i < N; i++)
         evalAsync(codes[i]);
-    } else if (finishedCount == 2*N) {
+    } else if (finishedCount == 2 * N) {
       SimpleTest.finish();
     }
   }
diff --git a/dom/asmjscache/test/test_slow.html b/dom/asmjscache/test/test_slow.html
index 2f19041b3816..88325f026d43 100644
--- a/dom/asmjscache/test/test_slow.html
+++ b/dom/asmjscache/test/test_slow.html
@@ -31,11 +31,11 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=854209
       script.src = "http://mochi.test:8888/tests/dom/asmjscache/test/file_slow.js";
       document.body.appendChild(script);
 
-      var w = new Worker('http://mochi.test:8888/tests/dom/asmjscache/test/file_slow.js');
+      var w = new Worker("http://mochi.test:8888/tests/dom/asmjscache/test/file_slow.js");
       w.onmessage = function(e) {
           ok(e.data === "ok", "Worker asm.js tests");
           complete();
-      }
+      };
 
       SimpleTest.waitForExplicitFinish();
   }
diff --git a/dom/asmjscache/test/test_workers.html b/dom/asmjscache/test/test_workers.html
index 6704459f6dd3..478340ced3df 100644
--- a/dom/asmjscache/test/test_workers.html
+++ b/dom/asmjscache/test/test_workers.html
@@ -28,7 +28,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=941830
       var workerCode = asmjsCode;
       workerCode += "if (f()() !== 42) postMessage('fail'); else postMessage('ok');";
       workerCode = 'var code = "' + workerCode + '"; eval(code); eval(code)';
-      var workerBlob = new Blob([workerCode], {type:"application/javascript"});
+      var workerBlob = new Blob([workerCode], {type: "application/javascript"});
 
       var mainCode = asmjsCode;
       mainCode += "ok(jsFuns.isAsmJSModuleLoadedFromCache(f), 'f is a cache hit')\n";
@@ -36,7 +36,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=941830
       mainCode += "ok(jsFuns.isAsmJSFunction(g42), 'g42 is an asm.js function');\n";
       mainCode += "ok(g42() === 42, 'g42 returns the correct result');\n";
       mainCode += "SimpleTest.finish();\n";
-      var mainBlob = new Blob([mainCode], {type:"application/javascript"});
+      var mainBlob = new Blob([mainCode], {type: "application/javascript"});
 
       var w = new Worker(URL.createObjectURL(workerBlob));
 
@@ -51,14 +51,14 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=941830
               ok(e.data === "ok", "Received second message");
               received = 2;
 
-              var script = document.createElement('script');
+              var script = document.createElement("script");
               script.src = URL.createObjectURL(mainBlob);
               document.body.appendChild(script);
               break;
             default:
               throw "Huh?";
           }
-      }
+      };
 
       SimpleTest.waitForExplicitFinish();
   }
diff --git a/dom/battery/test/test_battery_basics.html b/dom/battery/test/test_battery_basics.html
index 96f7f33685bc..eb29e7c8cc69 100644
--- a/dom/battery/test/test_battery_basics.html
+++ b/dom/battery/test/test_battery_basics.html
@@ -20,10 +20,10 @@ SimpleTest.waitForExplicitFinish();
 ok("getBattery" in navigator, "navigator.getBattery should exist");
 ok(!("battery" in navigator), "navigator.battery should not exist");
 
-navigator.getBattery().then(function (battery) {
+navigator.getBattery().then(function(battery) {
   ok(battery.level >= 0.0 && battery.level <= 1.0, "Battery level " + battery.level + " should be in the range [0.0, 1.0]");
 
-  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.default", true]]}, function () {
+  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.default", true]]}, function() {
     ok(battery.charging, "Battery should be charging by default");
     is(battery.chargingTime, 0, "Battery chargingTime " + battery.chargingTime + " should be zero by default");
     is(battery.dischargingTime, Infinity, "Battery dischargingTime should be Infinity by default");
diff --git a/dom/battery/test/test_battery_charging.html b/dom/battery/test/test_battery_charging.html
index 5d1e83284843..8ccdf3642040 100644
--- a/dom/battery/test/test_battery_charging.html
+++ b/dom/battery/test/test_battery_charging.html
@@ -17,10 +17,10 @@
 SimpleTest.waitForExplicitFinish();
 
 /** Test for Battery API **/
-navigator.getBattery().then(function (battery) {
+navigator.getBattery().then(function(battery) {
   ok(battery.level >= 0.0 && battery.level <= 1.0, "Battery level " + battery.level + " should be in the range [0.0, 1.0]");
 
-  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.charging", true]]}, function () {
+  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.charging", true]]}, function() {
     is(battery.charging, true, "Battery should be charging");
     ok(battery.chargingTime >= 0, "Battery chargingTime " + battery.chargingTime + " should be nonnegative when charging");
     is(battery.dischargingTime, Infinity, "Battery dischargingTime should be Infinity when charging");
diff --git a/dom/battery/test/test_battery_discharging.html b/dom/battery/test/test_battery_discharging.html
index 26a0359d3b89..5b5d867dfaac 100644
--- a/dom/battery/test/test_battery_discharging.html
+++ b/dom/battery/test/test_battery_discharging.html
@@ -17,10 +17,10 @@
 SimpleTest.waitForExplicitFinish();
 
 /** Test for Battery API **/
-navigator.getBattery().then(function (battery) {
+navigator.getBattery().then(function(battery) {
   ok(battery.level >= 0.0 && battery.level <= 1.0, "Battery level " + battery.level + " should be in the range [0.0, 1.0]");
 
-  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.discharging", true]]}, function () {
+  SpecialPowers.pushPrefEnv({"set": [["dom.battery.test.discharging", true]]}, function() {
     is(battery.charging, false, "Battery should be discharging");
     is(battery.chargingTime, Infinity, "Battery chargingTime should be Infinity when discharging");
     ok(battery.dischargingTime > 0, "Battery dischargingTime " + battery.dischargingTime + " should be positive when discharging");
diff --git a/dom/broadcastchannel/tests/broadcastchannel_sharedWorker.js b/dom/broadcastchannel/tests/broadcastchannel_sharedWorker.js
index bfc6a88d33a3..01d9062ed2b5 100644
--- a/dom/broadcastchannel/tests/broadcastchannel_sharedWorker.js
+++ b/dom/broadcastchannel/tests/broadcastchannel_sharedWorker.js
@@ -1,12 +1,12 @@
 onconnect = function(evt) {
   evt.ports[0].onmessage = function(evt) {
-    var bc = new BroadcastChannel('foobar');
-    bc.addEventListener('message', function(event) {
+    var bc = new BroadcastChannel("foobar");
+    bc.addEventListener("message", function(event) {
       bc.postMessage(event.data == "hello world from the window" ?
                        "hello world from the worker" : "KO");
       bc.close();
     });
 
     evt.target.postMessage("READY");
-  }
-}
+  };
+};
diff --git a/dom/broadcastchannel/tests/broadcastchannel_worker.js b/dom/broadcastchannel/tests/broadcastchannel_worker.js
index 18648295bba7..7fb5f8026ee0 100644
--- a/dom/broadcastchannel/tests/broadcastchannel_worker.js
+++ b/dom/broadcastchannel/tests/broadcastchannel_worker.js
@@ -3,16 +3,16 @@ onmessage = function(evt) {
     var worker = new Worker("broadcastchannel_worker.js");
     worker.onmessage = function(evt) {
       postMessage(evt.data);
-    }
+    };
     worker.postMessage(evt.data - 1);
     return;
   }
 
-  var bc = new BroadcastChannel('foobar');
-  bc.addEventListener('message', function(event) {
+  var bc = new BroadcastChannel("foobar");
+  bc.addEventListener("message", function(event) {
     bc.postMessage(event.data == "hello world from the window" ? "hello world from the worker" : "KO");
     bc.close();
   });
 
   postMessage("READY");
-}
+};
diff --git a/dom/broadcastchannel/tests/broadcastchannel_worker_alive.js b/dom/broadcastchannel/tests/broadcastchannel_worker_alive.js
index d2b244aaa423..f5be8a400538 100644
--- a/dom/broadcastchannel/tests/broadcastchannel_worker_alive.js
+++ b/dom/broadcastchannel/tests/broadcastchannel_worker_alive.js
@@ -1,7 +1,7 @@
-(new BroadcastChannel('foobar')).addEventListener('message', function(event) {
-  if (event.data != 'READY') {
+(new BroadcastChannel("foobar")).addEventListener("message", function(event) {
+  if (event.data != "READY") {
     event.target.postMessage(event.data);
   }
 });
 
-(new BroadcastChannel('foobar')).postMessage('READY');
+(new BroadcastChannel("foobar")).postMessage("READY");
diff --git a/dom/broadcastchannel/tests/broadcastchannel_worker_any.js b/dom/broadcastchannel/tests/broadcastchannel_worker_any.js
index da8625c4d8e9..bb4506eccf2d 100644
--- a/dom/broadcastchannel/tests/broadcastchannel_worker_any.js
+++ b/dom/broadcastchannel/tests/broadcastchannel_worker_any.js
@@ -1,5 +1,5 @@
-(new BroadcastChannel('foobar')).onmessage = function(event) {
+(new BroadcastChannel("foobar")).onmessage = function(event) {
   event.target.postMessage(event.data);
-}
+};
 
 postMessage("READY");
diff --git a/dom/broadcastchannel/tests/browser_private_browsing.js b/dom/broadcastchannel/tests/browser_private_browsing.js
index 35fa0aff755c..ae4f98fac9bf 100644
--- a/dom/broadcastchannel/tests/browser_private_browsing.js
+++ b/dom/broadcastchannel/tests/browser_private_browsing.js
@@ -30,39 +30,39 @@ add_task(async function() {
 
   var p1 = ContentTask.spawn(browser1, null, function(opts) {
     return new content.window.Promise(resolve => {
-      content.window.bc = new content.window.BroadcastChannel('foobar');
-      content.window.bc.onmessage = function(e) { resolve(e.data); }
+      content.window.bc = new content.window.BroadcastChannel("foobar");
+      content.window.bc.onmessage = function(e) { resolve(e.data); };
     });
   });
 
   var p2 = ContentTask.spawn(browser2, null, function(opts) {
     return new content.window.Promise(resolve => {
-      content.window.bc = new content.window.BroadcastChannel('foobar');
-      content.window.bc.onmessage = function(e) { resolve(e.data); }
+      content.window.bc = new content.window.BroadcastChannel("foobar");
+      content.window.bc.onmessage = function(e) { resolve(e.data); };
     });
   });
 
   await ContentTask.spawn(browser1, null, function(opts) {
     return new content.window.Promise(resolve => {
-      var bc = new content.window.BroadcastChannel('foobar');
-      bc.postMessage('hello world from private browsing');
+      var bc = new content.window.BroadcastChannel("foobar");
+      bc.postMessage("hello world from private browsing");
       resolve();
     });
   });
 
   await ContentTask.spawn(browser2, null, function(opts) {
     return new content.window.Promise(resolve => {
-      var bc = new content.window.BroadcastChannel('foobar');
-      bc.postMessage('hello world from non private browsing');
+      var bc = new content.window.BroadcastChannel("foobar");
+      bc.postMessage("hello world from non private browsing");
       resolve();
     });
   });
 
   var what1 = await p1;
-  is(what1, 'hello world from private browsing', 'No messages received from the other window.');
+  is(what1, "hello world from private browsing", "No messages received from the other window.");
 
   var what2 = await p2;
-  is(what2, 'hello world from non private browsing', 'No messages received from the other window.');
+  is(what2, "hello world from non private browsing", "No messages received from the other window.");
 
   BrowserTestUtils.removeTab(tab1);
   await BrowserTestUtils.closeWindow(win1);
diff --git a/dom/broadcastchannel/tests/file_mozbrowser.html b/dom/broadcastchannel/tests/file_mozbrowser.html
index 9985b273f83f..6370500d989d 100644
--- a/dom/broadcastchannel/tests/file_mozbrowser.html
+++ b/dom/broadcastchannel/tests/file_mozbrowser.html
@@ -8,11 +8,11 @@
 <div id="container"></div>
   <script type="application/javascript">
 
-  var ifr = document.createElement('iframe');
-  ifr.src = 'http://mochi.test:8888/tests/dom/broadcastchannel/tests/iframe_mozbrowser.html';
-  ifr.onload = function() { alert('DONE'); }
+  var ifr = document.createElement("iframe");
+  ifr.src = "http://mochi.test:8888/tests/dom/broadcastchannel/tests/iframe_mozbrowser.html";
+  ifr.onload = function() { alert("DONE"); };
 
-  var domParent = document.getElementById('container');
+  var domParent = document.getElementById("container");
   domParent.appendChild(ifr);
 
   </script>
diff --git a/dom/broadcastchannel/tests/file_mozbrowser2.html b/dom/broadcastchannel/tests/file_mozbrowser2.html
index e45a4d9cfed3..2e5f394eb891 100644
--- a/dom/broadcastchannel/tests/file_mozbrowser2.html
+++ b/dom/broadcastchannel/tests/file_mozbrowser2.html
@@ -8,12 +8,12 @@
 <div id="container"></div>
   <script type="application/javascript">
 
-  var ifr = document.createElement('iframe');
-  ifr.setAttribute('mozbrowser', true);
-  ifr.src = 'http://mochi.test:8888/tests/dom/broadcastchannel/tests/iframe_mozbrowser2.html';
-  ifr.onload = function() { alert('DONE'); }
+  var ifr = document.createElement("iframe");
+  ifr.setAttribute("mozbrowser", true);
+  ifr.src = "http://mochi.test:8888/tests/dom/broadcastchannel/tests/iframe_mozbrowser2.html";
+  ifr.onload = function() { alert("DONE"); };
 
-  var domParent = document.getElementById('container');
+  var domParent = document.getElementById("container");
   domParent.appendChild(ifr);
 
   </script>
diff --git a/dom/broadcastchannel/tests/iframe_broadcastchannel.html b/dom/broadcastchannel/tests/iframe_broadcastchannel.html
index fb9a12b4bdde..3c6ead800617 100644
--- a/dom/broadcastchannel/tests/iframe_broadcastchannel.html
+++ b/dom/broadcastchannel/tests/iframe_broadcastchannel.html
@@ -15,18 +15,18 @@ ok("BroadcastChannel" in window, "BroadcastChannel exists");
 
 var bc = new BroadcastChannel("foobar");
 ok(bc, "BroadcastChannel can be created");
-is(bc.name, 'foobar', "BroadcastChannel.name is foobar");
+is(bc.name, "foobar", "BroadcastChannel.name is foobar");
 
 ok("postMessage" in bc, "BroadcastChannel has postMessage() method");
 
 bc.onmessage = function(evt) {
-  ok(evt instanceof MessageEvent, 'evt is a MessageEvent');
-  is(evt.target, bc, 'MessageEvent.target is bc');
-  is(evt.target.name, 'foobar', 'MessageEvent.target.name is foobar');
-  is(evt.target.name, bc.name, 'MessageEvent.target.name is bc.name');
+  ok(evt instanceof MessageEvent, "evt is a MessageEvent");
+  is(evt.target, bc, "MessageEvent.target is bc");
+  is(evt.target.name, "foobar", "MessageEvent.target.name is foobar");
+  is(evt.target.name, bc.name, "MessageEvent.target.name is bc.name");
   is(evt.data, "Hello world from the window!", "Message received from the window");
   bc.postMessage("Hello world from the iframe!");
-}
+};
 
   </script>
 </body>
diff --git a/dom/broadcastchannel/tests/iframe_mozbrowser.html b/dom/broadcastchannel/tests/iframe_mozbrowser.html
index 3a6f5969fd8f..adbb77a0618c 100644
--- a/dom/broadcastchannel/tests/iframe_mozbrowser.html
+++ b/dom/broadcastchannel/tests/iframe_mozbrowser.html
@@ -7,8 +7,8 @@
 <body>
   <script type="application/javascript">
 
-var bc = new BroadcastChannel('foobar');
-bc.postMessage('This is wrong!');
+var bc = new BroadcastChannel("foobar");
+bc.postMessage("This is wrong!");
 
   </script>
 </body>
diff --git a/dom/broadcastchannel/tests/iframe_mozbrowser2.html b/dom/broadcastchannel/tests/iframe_mozbrowser2.html
index 3a6f5969fd8f..adbb77a0618c 100644
--- a/dom/broadcastchannel/tests/iframe_mozbrowser2.html
+++ b/dom/broadcastchannel/tests/iframe_mozbrowser2.html
@@ -7,8 +7,8 @@
 <body>
   <script type="application/javascript">
 
-var bc = new BroadcastChannel('foobar');
-bc.postMessage('This is wrong!');
+var bc = new BroadcastChannel("foobar");
+bc.postMessage("This is wrong!");
 
   </script>
 </body>
diff --git a/dom/broadcastchannel/tests/test_bfcache.html b/dom/broadcastchannel/tests/test_bfcache.html
index ee7196736335..6200af620452 100644
--- a/dom/broadcastchannel/tests/test_bfcache.html
+++ b/dom/broadcastchannel/tests/test_bfcache.html
@@ -39,7 +39,7 @@
     if (counter == 0) {
       ok(!e.persisted, "test page should have been persisted initially");
 
-      bc = new testWin.BroadcastChannel('a');
+      bc = new testWin.BroadcastChannel("a");
 
       SimpleTest.executeSoon(function() {
         info("New location: " + testUrl2);
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_any.html b/dom/broadcastchannel/tests/test_broadcastchannel_any.html
index 2225e7cad9a6..0e223f6d4c7d 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_any.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_any.html
@@ -12,37 +12,37 @@
 <script type="application/javascript">
 
 var tests = [
- 'hello world',
+ "hello world",
  123,
  null,
  true,
  new Date(),
- [ 1, 'test', true, new Date() ],
+ [ 1, "test", true, new Date() ],
  { a: true, b:  null, c: new Date(), d: [ true, false, {} ] },
- new Blob([123], { type: 'plain/text' })
+ new Blob([123], { type: "plain/text" }),
 ];
 
 var currentTest = null;
 
 function getType(a) {
   if (a === null || a === undefined)
-    return 'null';
+    return "null";
 
   if (Array.isArray(a))
-    return 'array';
+    return "array";
 
-  if (typeof a == 'object')
-    return 'object';
+  if (typeof a == "object")
+    return "object";
 
-  return 'primitive';
+  return "primitive";
 }
 
 function compare(a, b) {
-  is (getType(a), getType(b), 'Type matches');
+  is(getType(a), getType(b), "Type matches");
 
   var type = getType(a);
-  if (type == 'array') {
-    is (a.length, b.length, 'Array.length matches');
+  if (type == "array") {
+    is(a.length, b.length, "Array.length matches");
     for (var i = 0; i < a.length; ++i) {
       compare(a[i], b[i]);
     }
@@ -50,8 +50,8 @@ function compare(a, b) {
     return;
   }
 
-  if (type == 'object') {
-    ok (a !== b, 'They should not match');
+  if (type == "object") {
+    ok(a !== b, "They should not match");
 
     var aProps = [];
     for (var p in a) aProps.push(p);
@@ -59,8 +59,8 @@ function compare(a, b) {
     var bProps = [];
     for (var p in b) bProps.push(p);
 
-    is (aProps.length, bProps.length, 'Props match');
-    is (aProps.sort().toSource(), bProps.sort().toSource(), 'Props match - using toSource()');
+    is(aProps.length, bProps.length, "Props match");
+    is(aProps.sort().toSource(), bProps.sort().toSource(), "Props match - using toSource()");
 
     for (var p in a) {
       compare(a[p], b[p]);
@@ -69,8 +69,8 @@ function compare(a, b) {
     return;
   }
 
-  if (type != 'null') {
-    is (a.toSource(), b.toSource(), 'Matching using toSource()');
+  if (type != "null") {
+    is(a.toSource(), b.toSource(), "Matching using toSource()");
   }
 }
 
@@ -86,7 +86,7 @@ function runTest() {
     compare(event.data, currentTest);
     ++count;
     next();
-  }
+  };
 
   var bc2 = new BroadcastChannel("foobar");
   ok(bc2, "BroadcastChannel can be created");
@@ -101,7 +101,7 @@ function runTest() {
     compare(event.data, currentTest);
     ++count;
     next();
-  }
+  };
 
   function next() {
     if (count < 2) {
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_basic.html b/dom/broadcastchannel/tests/test_broadcastchannel_basic.html
index 6d0259c75ecb..b2aa1414ce4a 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_basic.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_basic.html
@@ -12,11 +12,11 @@
 <script type="application/javascript">
 
 function runTest() {
-  addEventListener('message', receiveMessage, false);
+  addEventListener("message", receiveMessage, false);
   function receiveMessage(evt) {
-    if (evt.data.status == 'OK') {
+    if (evt.data.status == "OK") {
       ok(true, evt.data.message);
-    } else if (evt.data.status == 'KO') {
+    } else if (evt.data.status == "KO") {
       ok(false, evt.data.message);
     } else {
       ok(false, "Unknown message");
@@ -27,26 +27,26 @@ function runTest() {
 
   var bc = new BroadcastChannel("foobar");
   ok(bc, "BroadcastChannel can be created");
-  is(bc.name, 'foobar', "BroadcastChannel.name is foobar");
+  is(bc.name, "foobar", "BroadcastChannel.name is foobar");
 
   ok("postMessage" in bc, "BroadcastChannel has postMessage() method");
 
   bc.onmessage = function(evt) {
     ok(evt instanceof MessageEvent, "This is a MessageEvent");
     is(evt.target, bc, "MessageEvent.target is bc");
-    is(evt.target.name, 'foobar', "MessageEvent.target.name is foobar");
+    is(evt.target.name, "foobar", "MessageEvent.target.name is foobar");
     is(evt.target.name, bc.name, "MessageEvent.target.name == bc.name");
-    ok(evt.origin.indexOf('http://mochi.test:8888') == 0, "MessageEvent.origin is correct");
+    ok(evt.origin.indexOf("http://mochi.test:8888") == 0, "MessageEvent.origin is correct");
     is(evt.data, "Hello world from the iframe!", "The message from the iframe has been received!");
     SimpleTest.finish();
-  }
+  };
 
   var div = document.getElementById("content");
   ok(div, "Parent exists");
 
   var ifr = document.createElement("iframe");
   ifr.addEventListener("load", iframeLoaded);
-  ifr.setAttribute('src', "iframe_broadcastchannel.html");
+  ifr.setAttribute("src", "iframe_broadcastchannel.html");
   div.appendChild(ifr);
 
   function iframeLoaded() {
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_close.html b/dom/broadcastchannel/tests/test_broadcastchannel_close.html
index 84d41db4f948..d9d523d18200 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_close.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_close.html
@@ -12,11 +12,11 @@
 <script type="application/javascript">
 
 function runTest() {
-  var receiver = new BroadcastChannel('foo');
-  var sequence = [ '2', 'done' ];
+  var receiver = new BroadcastChannel("foo");
+  var sequence = [ "2", "done" ];
   receiver.onmessage = function(e) {
     if (!sequence.length) {
-      ok (false, 'No more data is expected');
+      ok(false, "No more data is expected");
       return;
     }
 
@@ -28,29 +28,29 @@ function runTest() {
         SimpleTest.finish();
       });
     }
-  }
+  };
 
-  var x = new BroadcastChannel('foo');
+  var x = new BroadcastChannel("foo");
   x.close();
   try {
-    x.postMessage('1');
+    x.postMessage("1");
     ok(false, "PostMessage should throw if called after a close().");
-  } catch(e) {
+  } catch (e) {
     ok(true, "PostMessage should throw if called after a close().");
   }
 
-  var y = new BroadcastChannel('foo');
-  y.postMessage('2');
+  var y = new BroadcastChannel("foo");
+  y.postMessage("2");
   y.close();
   try {
-    y.postMessage('3');
+    y.postMessage("3");
     ok(false, "PostMessage should throw if called after a close().");
-  } catch(e) {
+  } catch (e) {
     ok(true, "PostMessage should throw if called after a close().");
   }
 
-  var z = new BroadcastChannel('foo');
-  z.postMessage('done');
+  var z = new BroadcastChannel("foo");
+  z.postMessage("done");
 }
 
 SimpleTest.waitForExplicitFinish();
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_close2.html b/dom/broadcastchannel/tests/test_broadcastchannel_close2.html
index a8a748c4622f..8dbf2850ef84 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_close2.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_close2.html
@@ -12,23 +12,23 @@
 <script type="application/javascript">
 
 function runTest() {
-  var c1 = new BroadcastChannel('foo');
-  var c2 = new BroadcastChannel('foo');
+  var c1 = new BroadcastChannel("foo");
+  var c2 = new BroadcastChannel("foo");
 
   var status = [];
   c2.onmessage = function(e) {
     status.push(e.data);
     if (status.length == 2) {
-      is (status[0], 'first', "First message has been received");
-      is (status[1], 'second', "Second message has been received");
+      is(status[0], "first", "First message has been received");
+      is(status[1], "second", "Second message has been received");
       SimpleTest.finish();
     }
 
     c2.close();
-  }
+  };
 
-  c1.postMessage('first');
-  c1.postMessage('second');
+  c1.postMessage("first");
+  c1.postMessage("second");
 }
 
 SimpleTest.waitForExplicitFinish();
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_self.html b/dom/broadcastchannel/tests/test_broadcastchannel_self.html
index 32df390be1b7..970602b1eca9 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_self.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_self.html
@@ -12,8 +12,8 @@
 <script type="application/javascript">
 
 function runTest() {
-  x = new BroadcastChannel('foo');
-  y = new BroadcastChannel('foo');
+  x = new BroadcastChannel("foo");
+  y = new BroadcastChannel("foo");
 
   function func(e) {
     is(e.target, y, "The target is !x");
@@ -26,7 +26,7 @@ function runTest() {
   x.onmessage = func;
   y.onmessage = func;
 
-  x.postMessage('foo');
+  x.postMessage("foo");
 }
 
 SimpleTest.waitForExplicitFinish();
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_sharedWorker.html b/dom/broadcastchannel/tests/test_broadcastchannel_sharedWorker.html
index 16f847acae4d..750e0484606b 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_sharedWorker.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_sharedWorker.html
@@ -23,12 +23,12 @@ Tests of DOM BroadcastChannel in SharedWorkers
 function runTests() {
   var worker = new SharedWorker("broadcastchannel_sharedWorker.js");
 
-  var bc = new BroadcastChannel('foobar');
+  var bc = new BroadcastChannel("foobar");
 
   worker.port.onmessage = function(event) {
     if (event.data == "READY") {
       ok(true, "SharedWorker is ready!");
-      bc.postMessage('hello world from the window');
+      bc.postMessage("hello world from the window");
     } else {
       ok(false, "Something wrong happened");
     }
@@ -38,9 +38,9 @@ function runTests() {
     is("hello world from the worker", event.data, "The message matches!");
     bc.close();
     SimpleTest.finish();
-  }
+  };
 
-  worker.port.postMessage('go');
+  worker.port.postMessage("go");
 }
 
 SimpleTest.waitForExplicitFinish();
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_worker.html b/dom/broadcastchannel/tests/test_broadcastchannel_worker.html
index 42e93cc1e10b..bee86effd717 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_worker.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_worker.html
@@ -23,12 +23,12 @@ Tests of DOM BroadcastChannel in workers
 function testWorker(x) {
   var worker = new Worker("broadcastchannel_worker.js");
 
-  var bc = new BroadcastChannel('foobar');
+  var bc = new BroadcastChannel("foobar");
 
   worker.onmessage = function(event) {
     if (event.data == "READY") {
       ok(true, "Worker is ready!");
-      bc.postMessage('hello world from the window');
+      bc.postMessage("hello world from the window");
     } else {
       ok(false, "Something wrong happened");
     }
@@ -38,7 +38,7 @@ function testWorker(x) {
     is("hello world from the worker", event.data, "The message matches!");
     bc.close();
     runTests();
-  }
+  };
 
   worker.postMessage(x);
 }
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_worker_alive.html b/dom/broadcastchannel/tests/test_broadcastchannel_worker_alive.html
index 8b1b03c4e7ee..aa9ab7a08f7e 100644
--- a/dom/broadcastchannel/tests/test_broadcastchannel_worker_alive.html
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_worker_alive.html
@@ -22,7 +22,7 @@ Tests of DOM BroadcastChannel in workers
 
 function runTests() {
   var id = 0;
-  (new BroadcastChannel('foobar')).onmessage = function(event) {
+  (new BroadcastChannel("foobar")).onmessage = function(event) {
     info("MSG: " + event.data);
 
     if (event.data == "READY") {
diff --git a/dom/broadcastchannel/tests/test_dataCloning.html b/dom/broadcastchannel/tests/test_dataCloning.html
index 6aa164e944bd..7aef75bf55fa 100644
--- a/dom/broadcastchannel/tests/test_dataCloning.html
+++ b/dom/broadcastchannel/tests/test_dataCloning.html
@@ -14,10 +14,10 @@
 
 let c = new BroadcastChannel("foo");
 
-try  {
+try {
   c.postMessage(Symbol());
   ok(false, "This should throw!");
-} catch(e) {
+} catch (e) {
   ok(true, "This should throw!");
   is(e.name, "DataCloneError", "Correct DataCloneError exception thrown");
 }
diff --git a/dom/broadcastchannel/tests/test_dataURL.html b/dom/broadcastchannel/tests/test_dataURL.html
index c479ee6e2f5e..ec1306c0f491 100644
--- a/dom/broadcastchannel/tests/test_dataURL.html
+++ b/dom/broadcastchannel/tests/test_dataURL.html
@@ -17,17 +17,17 @@ b.postMessage(42);
 
 SimpleTest.waitForExplicitFinish();
 
-onmessage= function(e) {
+onmessage = function(e) {
   is(e.data, 42, "BroadcastChannel works with data URLs");
   SimpleTest.finish();
-}
+};
 
 var url = "data:text/html,<script>" + document.getElementById("dataURL").textContent + "</" + "script>";
 
-var ifr = document.createElement('iframe');
+var ifr = document.createElement("iframe");
 document.body.appendChild(ifr);
 
-ifr.setAttribute('sandbox', 'allow-scripts');
+ifr.setAttribute("sandbox", "allow-scripts");
 ifr.src = url;
 </script>
 </body>
diff --git a/dom/broadcastchannel/tests/test_event_listener_leaks.html b/dom/broadcastchannel/tests/test_event_listener_leaks.html
index 02aa7933e0b5..a6edbf798add 100644
--- a/dom/broadcastchannel/tests/test_event_listener_leaks.html
+++ b/dom/broadcastchannel/tests/test_event_listener_leaks.html
@@ -25,7 +25,7 @@ async function useBroadcastChannel(contentWindow) {
 
   let bc = new contentWindow.BroadcastChannel(name);
   let outer = new BroadcastChannel(name);
-  outer.postMessage('foo');
+  outer.postMessage("foo");
 
   await new Promise(resolve => {
     bc.onmessage = e => {
diff --git a/dom/broadcastchannel/tests/test_invalidState.html b/dom/broadcastchannel/tests/test_invalidState.html
index 8e4a1df35480..8069add760eb 100644
--- a/dom/broadcastchannel/tests/test_invalidState.html
+++ b/dom/broadcastchannel/tests/test_invalidState.html
@@ -14,10 +14,10 @@
 var c = new BroadcastChannel("foo");
 c.close();
 
-try  {
+try {
   c.postMessage("bar");
   ok(false, "This should throw!");
-} catch(e) {
+} catch (e) {
   ok(true, "This should throw!");
   is(e.name, "InvalidStateError", "Correct invalid-state exception thrown");
 }
diff --git a/dom/broadcastchannel/tests/test_ordering.html b/dom/broadcastchannel/tests/test_ordering.html
index eab1f955e5ba..a1deeee9a06a 100644
--- a/dom/broadcastchannel/tests/test_ordering.html
+++ b/dom/broadcastchannel/tests/test_ordering.html
@@ -11,9 +11,9 @@
 
 <script type="application/javascript">
 
-let c1 = new BroadcastChannel('order');
-let c2 = new BroadcastChannel('order');
-let c3 = new BroadcastChannel('order');
+let c1 = new BroadcastChannel("order");
+let c2 = new BroadcastChannel("order");
+let c3 = new BroadcastChannel("order");
 
 let events = [];
 let doneCount = 0;
@@ -27,22 +27,22 @@ function whichBC(bc) {
 
 function handler(e) {
   events.push(e);
-  if (e.data == 'done') {
+  if (e.data == "done") {
     doneCount++;
     if (doneCount == 2) {
       is(events.length, 6, "Correct length");
-      is(whichBC(events[0].target), "c2", 'target for event 0');
-      is(events[0].data, 'from c1');
-      is(whichBC(events[1].target), "c3", 'target for event 1');
-      is(events[1].data, 'from c1');
-      is(whichBC(events[2].target), "c1", 'target for event 2');
-      is(events[2].data, 'from c3');
-      is(whichBC(events[3].target), "c2", 'target for event 3');
-      is(events[3].data, 'from c3');
-      is(whichBC(events[4].target), "c1", 'target for event 4');
-      is(events[4].data, 'done');
-      is(whichBC(events[5].target), "c3", 'target for event 5');
-      is(events[5].data, 'done');
+      is(whichBC(events[0].target), "c2", "target for event 0");
+      is(events[0].data, "from c1");
+      is(whichBC(events[1].target), "c3", "target for event 1");
+      is(events[1].data, "from c1");
+      is(whichBC(events[2].target), "c1", "target for event 2");
+      is(events[2].data, "from c3");
+      is(whichBC(events[3].target), "c2", "target for event 3");
+      is(events[3].data, "from c3");
+      is(whichBC(events[4].target), "c1", "target for event 4");
+      is(events[4].data, "done");
+      is(whichBC(events[5].target), "c3", "target for event 5");
+      is(events[5].data, "done");
 
       SimpleTest.finish();
     }
@@ -53,9 +53,9 @@ c1.onmessage = handler;
 c2.onmessage = handler;
 c3.onmessage = handler;
 
-c1.postMessage('from c1');
-c3.postMessage('from c3');
-c2.postMessage('done');
+c1.postMessage("from c1");
+c3.postMessage("from c3");
+c2.postMessage("done");
 
 SimpleTest.waitForExplicitFinish();
 
diff --git a/dom/console/ConsoleAPIStorage.js b/dom/console/ConsoleAPIStorage.js
index cdcaeed08fb6..717862a7887a 100644
--- a/dom/console/ConsoleAPIStorage.js
+++ b/dom/console/ConsoleAPIStorage.js
@@ -8,13 +8,13 @@ ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
 ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 // This constant tells how many messages to process in a single timer execution.
-const MESSAGES_IN_INTERVAL = 1500
+const MESSAGES_IN_INTERVAL = 1500;
 
 const STORAGE_MAX_EVENTS = 1000;
 
 var _consoleStorage = new Map();
 
-const CONSOLEAPISTORAGE_CID = Components.ID('{96cf7855-dfa9-4c6d-8276-f9705b4890f2}');
+const CONSOLEAPISTORAGE_CID = Components.ID("{96cf7855-dfa9-4c6d-8276-f9705b4890f2}");
 
 /**
  * The ConsoleAPIStorage is meant to cache window.console API calls for later
@@ -43,29 +43,25 @@ function ConsoleAPIStorageService() {
 }
 
 ConsoleAPIStorageService.prototype = {
-  classID : CONSOLEAPISTORAGE_CID,
+  classID: CONSOLEAPISTORAGE_CID,
   QueryInterface: ChromeUtils.generateQI([Ci.nsIConsoleAPIStorage,
                                           Ci.nsIObserver]),
 
-  observe: function CS_observe(aSubject, aTopic, aData)
-  {
+  observe: function CS_observe(aSubject, aTopic, aData) {
     if (aTopic == "xpcom-shutdown") {
       Services.obs.removeObserver(this, "xpcom-shutdown");
       Services.obs.removeObserver(this, "inner-window-destroyed");
       Services.obs.removeObserver(this, "memory-pressure");
-    }
-    else if (aTopic == "inner-window-destroyed") {
+    } else if (aTopic == "inner-window-destroyed") {
       let innerWindowID = aSubject.QueryInterface(Ci.nsISupportsPRUint64).data;
       this.clearEvents(innerWindowID + "");
-    }
-    else if (aTopic == "memory-pressure") {
+    } else if (aTopic == "memory-pressure") {
       this.clearEvents();
     }
   },
 
   /** @private */
-  init: function CS_init()
-  {
+  init: function CS_init() {
     Services.obs.addObserver(this, "xpcom-shutdown");
     Services.obs.addObserver(this, "inner-window-destroyed");
     Services.obs.addObserver(this, "memory-pressure");
@@ -82,8 +78,7 @@ ConsoleAPIStorageService.prototype = {
    *          given this function returns all of the cached events, from any
    *          window.
    */
-  getEvents: function CS_getEvents(aId)
-  {
+  getEvents: function CS_getEvents(aId) {
     if (aId != null) {
       return (_consoleStorage.get(aId) || []).slice(0);
     }
@@ -111,8 +106,7 @@ ConsoleAPIStorageService.prototype = {
    * @param object aEvent
    *        A JavaScript object you want to store.
    */
-  recordEvent: function CS_recordEvent(aId, aOuterId, aEvent)
-  {
+  recordEvent: function CS_recordEvent(aId, aOuterId, aEvent) {
     if (!_consoleStorage.has(aId)) {
       _consoleStorage.set(aId, []);
     }
@@ -138,12 +132,10 @@ ConsoleAPIStorageService.prototype = {
    *        messages. If this is not specified all of the cached messages are
    *        cleared, from all window objects.
    */
-  clearEvents: function CS_clearEvents(aId)
-  {
+  clearEvents: function CS_clearEvents(aId) {
     if (aId != null) {
       _consoleStorage.delete(aId);
-    }
-    else {
+    } else {
       _consoleStorage.clear();
       Services.obs.notifyObservers(null, "console-storage-reset");
     }
diff --git a/dom/console/tests/console.jsm b/dom/console/tests/console.jsm
index 10bb66c88049..d2f1121ff417 100644
--- a/dom/console/tests/console.jsm
+++ b/dom/console/tests/console.jsm
@@ -5,7 +5,7 @@
 var EXPORTED_SYMBOLS = [ "ConsoleTest" ];
 
 var ConsoleTest = {
-  go: function(dumpFunction) {
+  go(dumpFunction) {
     console.log("Hello world!");
     console.createInstance().log("Hello world!");
 
@@ -23,5 +23,5 @@ var ConsoleTest = {
     console.createInstance({ innerID: "LEVEL",  maxLogLevel: "All" }).log("Hello world!");
     console.createInstance({ innerID: "LEVEL", maxLogLevelPref: "foo.pref" }).log("Invisible!");
     console.createInstance({ innerID: "LEVEL", maxLogLevelPref: "pref.test.console" }).log("Hello world!");
-  }
+  },
 };
diff --git a/dom/console/tests/test_bug659625.html b/dom/console/tests/test_bug659625.html
index 751a0881b998..c1ac27b8af99 100644
--- a/dom/console/tests/test_bug659625.html
+++ b/dom/console/tests/test_bug659625.html
@@ -22,7 +22,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=659625
       "Only one event remains in consoleAPIStorage");
     ok(storage.getEvents()[0].level === "clear",
       "Remaining event has level 'clear'");
-  }
+  };
 
   storage.clearEvents();
   ok(storage.getEvents().length === 0,
@@ -69,21 +69,21 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=659625
   }
   clearAndCheckStorage();
 
-  console.group("group-label")
+  console.group("group-label");
   console.log("group-log");
   ok(storage.getEvents().length === 3,
     "2 new console events registered for group + log");
   clearAndCheckStorage();
 
-  console.groupCollapsed("group-collapsed")
+  console.groupCollapsed("group-collapsed");
   console.log("group-collapsed-log");
   ok(storage.getEvents().length === 3,
     "2 new console events registered for groupCollapsed + log");
   clearAndCheckStorage();
 
-  console.group("closed-group-label")
+  console.group("closed-group-label");
   console.log("group-log");
-  console.groupEnd()
+  console.groupEnd();
   ok(storage.getEvents().length === 4,
     "3 new console events registered for group/groupEnd");
   clearAndCheckStorage();
diff --git a/dom/console/tests/test_bug978522.html b/dom/console/tests/test_bug978522.html
index 33d1d56a8f04..bedbaf2f254a 100644
--- a/dom/console/tests/test_bug978522.html
+++ b/dom/console/tests/test_bug978522.html
@@ -13,16 +13,16 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=978522
 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=978522">Mozilla Bug 978522</a>
 <script type="application/javascript">
 
-  console.log('%s', {
-    toString: function() {
-      console.log('%s', {
-        toString: function() {
-          ok(true, "Still alive \\o/");
-          SimpleTest.finish();
-          return "hello world";
-        }
-      });
-    }
+  console.log("%s", {
+    toString() {
+    console.log("%s", {
+      toString() {
+      ok(true, "Still alive \\o/");
+      SimpleTest.finish();
+      return "hello world";
+    },
+    });
+  },
   });
 
   SimpleTest.waitForExplicitFinish();
diff --git a/dom/console/tests/test_console_binding.html b/dom/console/tests/test_console_binding.html
index 2070dbf5f988..afec68648a4a 100644
--- a/dom/console/tests/test_console_binding.html
+++ b/dom/console/tests/test_console_binding.html
@@ -15,10 +15,10 @@ function consoleListener() {
 
 var order = 0;
 consoleListener.prototype  = {
-  observe: function(aSubject, aTopic, aData) {
+  observe(aSubject, aTopic, aData) {
     if (aTopic == "console-api-log-event") {
       var obj = aSubject.wrappedJSObject;
-      if (order+1 == parseInt(obj.arguments[0])) {
+      if (order + 1 == parseInt(obj.arguments[0])) {
         ok(true, "Message received: " + obj.arguments[0]);
         order++;
       }
@@ -26,16 +26,16 @@ consoleListener.prototype  = {
       if (order == 3) {
         SpecialPowers.removeObserver(this, "console-api-log-event");
         SimpleTest.finish();
-        return;
+
       }
     }
-  }
-}
+  },
+};
 
 var cl = new consoleListener();
 SimpleTest.waitForExplicitFinish();
 
-[1,2,3].forEach(console.log);
+[1, 2, 3].forEach(console.log);
 
   </script>
 </body>
diff --git a/dom/console/tests/test_count.html b/dom/console/tests/test_count.html
index e301fce9b517..15512163ada0 100644
--- a/dom/console/tests/test_count.html
+++ b/dom/console/tests/test_count.html
@@ -18,7 +18,7 @@ function ConsoleListener() {
 ConsoleListener.prototype = {
   observe(aSubject, aTopic, aData) {
     let obj = aSubject.wrappedJSObject;
-    if (obj.arguments[0] != 'test') {
+    if (obj.arguments[0] != "test") {
       return;
     }
 
diff --git a/dom/console/tests/test_devtools_pref.html b/dom/console/tests/test_devtools_pref.html
index 9c7231576e2a..9445445f22fa 100644
--- a/dom/console/tests/test_devtools_pref.html
+++ b/dom/console/tests/test_devtools_pref.html
@@ -20,9 +20,9 @@ function consoleListener(expected) {
           SpecialPowers.removeObserver(observer, "console-api-log-event");
           SpecialPowers.removeObserver(observer, "console-api-profiler");
           done(messages);
-          return;
+
         }
-      }
+      },
     };
     SpecialPowers.addObserver(observer, "console-api-log-event");
     SpecialPowers.addObserver(observer, "console-api-profiler");
@@ -30,7 +30,7 @@ function consoleListener(expected) {
 }
 
 SimpleTest.waitForExplicitFinish();
-(async function () {
+(async function() {
   var onMessages = consoleListener(4);
 
   await SpecialPowers.pushPrefEnv({set: [["devtools.enabled", false]]});
diff --git a/dom/console/tests/xpcshell/test_basic.js b/dom/console/tests/xpcshell/test_basic.js
index ca0c8db99747..dd38235a7798 100644
--- a/dom/console/tests/xpcshell/test_basic.js
+++ b/dom/console/tests/xpcshell/test_basic.js
@@ -12,7 +12,7 @@ add_task(async function() {
     }
 
     consoleListener.prototype  = {
-      observe: function(aSubject, aTopic, aData) {
+      observe(aSubject, aTopic, aData) {
         let obj = aSubject.wrappedJSObject;
         Assert.ok(obj.arguments[0] === 42, "Message received!");
         Assert.ok(obj.ID === "jsm", "The ID is JSM");
@@ -20,7 +20,7 @@ add_task(async function() {
 
         Services.obs.removeObserver(this, "console-api-log-event");
         resolve();
-      }
+      },
     };
 
     new consoleListener();
diff --git a/dom/console/tests/xpcshell/test_reportForServiceWorkerScope.js b/dom/console/tests/xpcshell/test_reportForServiceWorkerScope.js
index e378184810bf..865f87d589da 100644
--- a/dom/console/tests/xpcshell/test_reportForServiceWorkerScope.js
+++ b/dom/console/tests/xpcshell/test_reportForServiceWorkerScope.js
@@ -10,7 +10,7 @@ add_task(async function() {
     }
 
     consoleListener.prototype  = {
-      observe: function(aSubject, aTopic, aData) {
+      observe(aSubject, aTopic, aData) {
         let obj = aSubject.wrappedJSObject;
         Assert.ok(obj.arguments[0] === "Hello world!", "Message received!");
         Assert.ok(obj.ID === "scope", "The ID is the scope");
@@ -22,7 +22,7 @@ add_task(async function() {
 
         Services.obs.removeObserver(this, "console-api-log-event");
         resolve();
-      }
+      },
     };
 
     new consoleListener();