--- a/browser/extensions/formautofill/.eslintrc.js
+++ b/browser/extensions/formautofill/.eslintrc.js
@@ -12,18 +12,18 @@ module.exports = { // eslint-disable-lin
     "TextDecoder": false,
     "TextEncoder": false,
   },
 
   "rules": {
     // Rules from the mozilla plugin
     "mozilla/balanced-listeners": "error",
     "mozilla/no-aArgs": "warn",
-    "mozilla/no-cpows-in-tests": "warn",
-    "mozilla/var-only-at-top-level": "warn",
+    "mozilla/no-cpows-in-tests": "error",
+    "mozilla/var-only-at-top-level": "error",
 
     "valid-jsdoc": ["error", {
       "prefer": {
         "return": "returns",
       },
       "preferType": {
         "Boolean": "boolean",
         "Number": "number",