Bug 1894517 - Add region-specific parameter to Pocket feed URL for experimentation. r=home-newtab-reviewers,nbarrett

Differential Revision: https://phabricator.services.mozilla.com/D209075

browser/app/profile/firefox.js

@@ -1771,6 +1771,9 @@ pref("browser.newtabpage.activity-stream.discoverystream.region-spocs-config", "
 // List of regions that don't get the 7 row layout.
 pref("browser.newtabpage.activity-stream.discoverystream.region-basic-config", "");
 
+// Add parameters to Pocket feed URL.
+pref("browser.newtabpage.activity-stream.discoverystream.pocket-feed-parameters", "&enableRankingByRegion=1");
+
 // Allows Pocket story collections to be dismissed.
 pref("browser.newtabpage.activity-stream.discoverystream.isCollectionDismissible", true);
 pref("browser.newtabpage.activity-stream.discoverystream.personalization.enabled", true);

browser/components/newtab/lib/DiscoveryStreamFeed.sys.mjs

@@ -564,10 +564,17 @@ export class DiscoveryStreamFeed {
   }
 
   generateFeedUrl(isBff) {
+    // check for experiment parameters
+    const hasParameters = lazy.NimbusFeatures.pocketNewtab.getVariable(
+      "pocketFeedParameters"
+    );
+
     if (isBff) {
       return `https://${Services.prefs.getStringPref(
         "extensions.pocket.bffApi"
-      )}/desktop/v1/recommendations?locale=$locale&region=$region&count=30`;
+      )}/desktop/v1/recommendations?locale=$locale&region=$region&count=30${
+        hasParameters || ""
+      }`;
     }
     return FEED_URL;
   }

toolkit/components/nimbus/FeatureManifest.yaml

@@ -958,6 +958,12 @@ pocketNewtab:
       type: boolean
       fallbackPref: >-
         browser.topsites.contile.sov.enabled
+    pocketFeedParameters:
+      type: string
+      fallbackPref: >-
+        browser.newtabpage.activity-stream.discoverystream.pocket-feed-parameters
+      description: >-
+        Add parameters to Pocket feed URL.
 
 saveToPocket:
   description: The save to Pocket feature