Refactor ZenThemesImporter to remove unnecessary chrome URL match; update migration version in ZenUIMigration for consistency

src/browser/base/zen-components/ZenThemesImporter.mjs

@@ -313,10 +313,8 @@ gZenActorsManager.addJSWindowActor('ZenThemeMarketplace', {
       DOMContentLoaded: {},
     },
   },
-  includeChrome: true,
   matches: [
     ...Services.prefs.getStringPref('zen.injections.match-urls').split(','),
-    'about:preferences',
-    'chrome://browser/content/browser.xhtml',
+    'about:preferences'
   ],
 });

src/browser/base/zen-components/ZenUIMigration.mjs

@@ -6,7 +6,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
 
 class ZenUIMigration {
   PREF_NAME = 'zen.migration.version';
-  MIGRATION_VERSION = 2;
+  MIGRATION_VERSION = 1;
 
   init(isNewProfile, win) {
     if (!isNewProfile) {
@@ -27,9 +27,6 @@ class ZenUIMigration {
     if (this._migrationVersion < 1) {
       this._migrateV1(win);
     }
-    if (this._migrationVersion < 2) {
-      this._migrateV2(win);
-    }
   }
 
   clearVariables() {
@@ -60,11 +57,6 @@ class ZenUIMigration {
       ]
     );
   }
-
-  async _migrateV2(win) {
-    // Just check for mods updates until we get an actual implementation
-    document.dispatchEvent(new CustomEvent('ZenCheckForThemeUpdates'));
-  }
 }
 
 export var gZenUIMigration = new ZenUIMigration();