diff --git a/toolkit/components/webextensions/moz.build b/toolkit/components/webextensions/moz.build
index a38f17c380..b1f7657efd 100644
--- a/toolkit/components/webextensions/moz.build
+++ b/toolkit/components/webextensions/moz.build
@@ -12,7 +12,7 @@ EXTRA_JS_MODULES += [
     'ExtensionContent.jsm',
     'ExtensionManagement.jsm',
     'ExtensionParent.jsm',
-#    'ExtensionStorage.jsm',
+    'ExtensionStorage.jsm',
     'ExtensionUtils.jsm',
     'LegacyExtensionsUtils.jsm',
     'MessageChannel.jsm',
diff --git a/toolkit/components/webextensions/schemas/manifest.json b/toolkit/components/webextensions/schemas/manifest.json
index 7212db4781..b78bde34db 100644
--- a/toolkit/components/webextensions/schemas/manifest.json
+++ b/toolkit/components/webextensions/schemas/manifest.json
@@ -247,6 +247,7 @@
               "menus",
               "notifications",
               "privacy",
+              "proxy",
               "storage"
               ,"unlimitedStorage"
             ]