🐛 Fix pref.js formatting

package.json

@@ -93,7 +93,8 @@
       {
         "files": "src/prefs.js",
         "options": {
-          "semi": true
+          "semi": true,
+          "trailingComma": "es5"
         }
       }
     ]

src/prefs.js

@@ -16,7 +16,11 @@ pref('browser.search.engine.default', '[email protected]');
 // Context menu prefs
 pref(
   'browser.contextmenus.page',
-  'link__copy,link__new-tab,separator,selection__copy',
+  'link__copy,link__new-tab,separator,selection__copy'
+);
+pref(
+  'browser.uiCustomization.state',
+  '{"type":"block","direction":"vertical","content":[{"type":"block","direction":"horizontal","size":{"type":"content"},"content":[{"type":"tabs"},{"type":"icon","icon":"add-line"}],"color":"base"},{"type":"block","direction":"horizontal","size":{"type":"content"},"content":[{"type":"icon","icon":"arrow-left-line"},{"type":"icon","icon":"refresh-line"},{"type":"icon","icon":"arrow-right-line"},{"type":"spacer","grow":1},{"type":"omnibox"},{"type":"spacer","grow":1},{"type":"icon","icon":"menu-line"}],"color":"surface-0"},{"type":"browser"}],"size":{"type":"grow","value":1},"color":"base"}'
 );
 pref(
   'browser.uiCustomization.state',
@@ -86,7 +90,7 @@ pref('browser.download.alwaysOpenInSystemViewerContextMenuItem', true);
 // viewable internally.
 pref(
   'browser.download.viewableInternally.enabledTypes',
-  'xml,svg,webp,avif,jxl',
+  'xml,svg,webp,avif,jxl'
 );
 
 // This controls whether the button is automatically shown/hidden depending