--- a/accessible/tests/browser/.eslintrc.js
+++ b/accessible/tests/browser/.eslintrc.js
@@ -1,11 +1,11 @@
 "use strict";
 
-module.exports = { // eslint-disable-line no-undef
+module.exports = {
   "extends": [
     "plugin:mozilla/browser-test"
   ],
   // All globals made available in the test environment.
   "globals": {
     // Content scripts have global 'content' object
     "content": true,
 
@@ -46,145 +46,101 @@ module.exports = { // eslint-disable-lin
     "waitForEvent": true,
     "waitForMultipleEvents": true,
     "invokeSetAttribute": true,
     "invokeSetStyle": true,
     "invokeFocus": true,
     "findAccessibleChildByID": true
   },
   "rules": {
-    "mozilla/no-aArgs": "warn",
-    "mozilla/no-cpows-in-tests": "warn",
-    "mozilla/reject-importGlobalProperties": "warn",
-    "mozilla/var-only-at-top-level": "warn",
+    "mozilla/no-aArgs": "error",
+    "mozilla/no-cpows-in-tests": "error",
+    "mozilla/reject-importGlobalProperties": "error",
+    "mozilla/var-only-at-top-level": "error",
 
     "block-scoped-var": "error",
-    "brace-style": ["error", "1tbs"],
     "camelcase": "error",
     "comma-dangle": ["error", "never"],
-    "comma-spacing": "error",
     "comma-style": ["error", "last"],
     "complexity": ["error", 20],
     "consistent-this": "off",
     "curly": ["error", "multi-line"],
     "default-case": "off",
     "dot-location": ["error", "property"],
     "dot-notation": "error",
-    "eol-last": "error",
     "eqeqeq": "off",
-    "func-call-spacing": "error",
     "func-names": "off",
     "func-style": "off",
-    "generator-star": "off",
-    "global-strict": "off",
+    "generator-star-spacing": "off",
     "handle-callback-err": ["error", "er"],
     "indent": ["error", 2, {"SwitchCase": 1}],
-    "key-spacing": ["error", {"beforeColon": false, "afterColon": true}],
-    "linebreak-style": "off",
-    "max-depth": "off",
     "max-nested-callbacks": ["error", 4],
     "max-params": "off",
     "max-statements": "off",
     "new-cap": ["error", {"capIsNew": false}],
     "new-parens": "error",
     "no-array-constructor": "error",
     "no-bitwise": "off",
     "no-caller": "error",
     "no-catch-shadow": "error",
     "no-comma-dangle": "off",
-    "no-cond-assign": "error",
     "no-console": "off",
     "no-constant-condition": "off",
     "no-continue": "off",
     "no-control-regex": "error",
-    "no-debugger": "error",
-    "no-delete-var": "error",
     "no-div-regex": "off",
-    "no-dupe-args": "error",
-    "no-dupe-keys": "error",
-    "no-duplicate-case": "error",
-    "no-else-return": "error",
-    "no-empty": "error",
-    "no-empty-character-class": "error",
     "no-eval": "error",
-    "no-ex-assign": "error",
     "no-extend-native": "error",
-    "no-extra-bind": "error",
-    "no-extra-boolean-cast": "error",
     "no-extra-parens": "off",
     "no-extra-semi": "error",
     "no-extra-strict": "off",
     "no-fallthrough": "error",
     "no-floating-decimal": "off",
     "no-inline-comments": "off",
-    "no-lonely-if": "error",
     "no-mixed-requires": "off",
-    "no-mixed-spaces-and-tabs": "error",
-    "no-multi-spaces": "error",
     "no-multi-str": "error",
     "no-multiple-empty-lines": ["error", {"max": 1}],
-    "no-native-reassign": "error",
-    "no-nested-ternary": "error",
     "no-new-require": "off",
-    "no-octal": "error",
     "no-param-reassign": "off",
     "no-path-concat": "off",
     "no-plusplus": "off",
     "no-process-env": "off",
     "no-process-exit": "off",
     "no-proto": "error",
-    "no-redeclare": "error",
-    "no-regex-spaces": "error",
     "no-reserved-keys": "off",
     "no-restricted-modules": "off",
     "no-return-assign": "error",
     "no-script-url": "off",
-    "no-self-compare": "error",
     "no-sequences": "error",
     "no-shadow": "error",
-    "no-shadow-restricted-names": "error",
     "no-space-before-semi": "off",
     "no-sparse-arrays": "error",
     "no-sync": "off",
     "no-ternary": "off",
     "no-throw-literal": "error",
-    "no-trailing-spaces": "error",
-    "no-undef": "error",
     "no-underscore-dangle": "off",
     "no-undefined": "off",
     "no-unneeded-ternary": "error",
-    "no-unreachable": "error",
     "no-unused-vars": ["error", {"vars": "all", "args": "none"}],
     "no-use-before-define": "off",
     "no-var": "off",
     "no-warning-comments": "off",
-    "no-with": "error",
     "object-shorthand": "off",
     "one-var": ["error", "never"],
     "padded-blocks": ["error", "never"],
     "quote-props": "off",
     "radix": "error",
     "semi": ["error", "always"],
     "semi-spacing": ["error", {"before": false, "after": true}],
     "sort-vars": "off",
-    "space-after-function-name": "off",
-    "keyword-spacing": "error",
-    "space-before-blocks": "error",
-    "space-before-function-parentheses": "off",
-    "space-before-function-paren": ["error", "never"],
     "space-in-brackets": "off",
     "space-in-parens": ["error", "never"],
-    "space-infix-ops": ["error", {"int32Hint": true}],
-    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
     "space-unary-word-ops": "off",
-    "spaced-comment": ["error", "always"],
     "strict": ["error", "global"],
-    "use-isnan": "error",
     "valid-jsdoc": "off",
-    "valid-typeof": "error",
     "vars-on-top": "off",
     "wrap-iife": "off",
     "wrap-regex": "off",
     "yoda": "error",
 
     "guard-for-in": "off",
     "newline-after-var": "off",
     "no-alert": "off",