Bug 1904310 - Disabled system add-on updates and remove the update url. r=webdriver-reviewers,jdescottes

Differential Revision: https://phabricator.services.mozilla.com/D217410

remote/shared/RecommendedPreferences.sys.mjs

@@ -265,10 +265,7 @@ const COMMON_PREFERENCES = new Map([
     "http://%(server)s/extensions-dummy/blocklistItemURL",
   ],
   ["extensions.hotfix.url", "http://%(server)s/extensions-dummy/hotfixURL"],
-  [
-    "extensions.systemAddon.update.url",
-    "http://%(server)s/dummy-system-addons.xml",
-  ],
+  ["extensions.systemAddon.update.enabled", false],
   [
     "extensions.update.background.url",
     "http://%(server)s/extensions-dummy/updateBackgroundURL",

testing/marionette/client/marionette_driver/geckoinstance.py

@@ -107,7 +107,7 @@ class GeckoInstance(object):
         ),
         "extensions.blocklist.itemURL": "http://%(server)s/extensions-dummy/blocklistItemURL",
         "extensions.hotfix.url": "http://%(server)s/extensions-dummy/hotfixURL",
-        "extensions.systemAddon.update.url": "http://%(server)s/dummy-system-addons.xml",
+        "extensions.systemAddon.update.enabled": False,
         "extensions.update.background.url": (
             "http://%(server)s/extensions-dummy/updateBackgroundURL"
         ),