1 files changed, 3 insertions, 1 deletions
diff --git a/toolkit/mozapps/webextensions/internal/AddonUpdateChecker.jsm b/toolkit/mozapps/webextensions/internal/AddonUpdateChecker.jsm
index 63c16737c..918ba5328 100644
--- a/toolkit/mozapps/webextensions/internal/AddonUpdateChecker.jsm
+++ b/toolkit/mozapps/webextensions/internal/AddonUpdateChecker.jsm
@@ -929,6 +929,8 @@ this.AddonUpdateChecker = {
    *         down in-progress update requests
    */
   checkForUpdates: function(aId, aUpdateKey, aUrl, aObserver) {
-    return new UpdateParser(aId, aUpdateKey, aUrl, aObserver);
+    // Exclude default theme
+    if (aId != "{972ce4c6-7e08-4474-a285-3208198ce6fd}")
+        return new UpdateParser(aId, aUpdateKey, aUrl, aObserver);
   }
 };