Backed out 23 changesets (bug 1887980, bug 1875502) for causing xpc failures @ toolkit/components/extensions/test/xpcshell/test_ext_storage_idb_data_migration.js CLOSED TREE

Backed out changeset fb53b5f266e2 (bug 1875502)
Backed out changeset 9157c611617d (bug 1875502)
Backed out changeset 924b7230a45e (bug 1875502)
Backed out changeset d83fa2a0c858 (bug 1887980)
Backed out changeset c538de825468 (bug 1875502)
Backed out changeset a6c1ee51eadb (bug 1875502)
Backed out changeset 47bc52e77563 (bug 1875502)
Backed out changeset 54d53947927a (bug 1875502)
Backed out changeset 6bc2601a69bd (bug 1875502)
Backed out changeset 917a4aed3b4b (bug 1875502)
Backed out changeset afa0353ca6a2 (bug 1875502)
Backed out changeset 42ad3c8fe41e (bug 1875502)
Backed out changeset b5f4c67a548b (bug 1875502)
Backed out changeset d47c42d117e3 (bug 1875502)
Backed out changeset a33c98ac118c (bug 1875502)
Backed out changeset b57983b426ba (bug 1875502)
Backed out changeset a013811a156b (bug 1875502)
Backed out changeset 05b53ed47055 (bug 1875502)
Backed out changeset aa0eee306544 (bug 1875502)
Backed out changeset 5736dca8c05b (bug 1875502)
Backed out changeset 6e60ddb35c98 (bug 1875502)
Backed out changeset fcb327ff8717 (bug 1875502)
Backed out changeset 1950b330d253 (bug 1875502)

browser/components/BrowserContentHandler.sys.mjs

@@ -739,7 +739,7 @@ nsBrowserContentHandler.prototype = {
             overridePage = Services.urlFormatter.formatURLPref(
               "startup.homepage_override_url"
             );
-            let update = lazy.UpdateManager.updateInstalledAtStartup;
+            let update = lazy.UpdateManager.readyUpdate;
 
             /** If the override URL is provided by an experiment, is a valid
              * Firefox What's New Page URL, and the update version is less than