Bug 1750998 - Enable loading site-specific wrapper scripts on debug builds. r=mhowell

Differential Revision: https://phabricator.services.mozilla.com/D136739

browser/extensions/pictureinpicture/tests/browser/browser.ini

@@ -14,5 +14,4 @@ prefs =
   media.videocontrols.picture-in-picture.video-toggle.position="right"
 
 [browser_mock_wrapper.js]
-skip-if =
-  debug || !nightly_build # Bug 1749819
+skip-if = !nightly_build # Bug 1751793

toolkit/actors/PictureInPictureChild.jsm

@@ -1404,9 +1404,9 @@ class PictureInPictureChild extends JSWindowActorChild {
 
     // gSiteOverrides is a list of tuples where the first element is the MatchPattern
     // for a supported site and the second is the actual overrides object for it.
-    // TODO: Remove DEBUG and NIGHTLY_BUILD checks (see Bug 1750998).
+    // TODO: Remove NIGHTLY_BUILD check (see Bug 1751793).
     let wrapperPath =
-      AppConstants.NIGHTLY_BUILD && !AppConstants.DEBUG && overrides
+      AppConstants.NIGHTLY_BUILD && overrides
         ? overrides[1].videoWrapperScriptPath
         : null;
     this.videoWrapper = new PictureInPictureChildVideoWrapper(