Add mozilla addon linter to test suite

package.json

@@ -9,7 +9,7 @@
     "dist": "gulp dist",
     "doc": "jsdoc -c development/tools/.jsdoc.json",
     "publish-docs": "gh-pages -d docs/jsdocs",
-    "test": "npm run test:unit && npm run test:integration && npm run lint",
+    "test": "npm run test:unit && npm run test:integration && npm run lint && npm run mozilla-lint",
     "watch:test:unit": "nodemon --exec \"npm run test:unit\" ./test ./app ./ui",
     "test:unit": "cross-env METAMASK_ENV=test mocha --exit --require test/setup.js --recursive \"test/unit/**/*.js\" \"ui/app/**/*.test.js\" && dot-only-hunter",
     "test:single": "cross-env METAMASK_ENV=test mocha --require test/helper.js",
@@ -41,6 +41,7 @@
     "sentry:publish": "node ./development/sentry-publish.js",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
+    "mozilla-lint": "addons-linter dist/firefox",
     "ui": "npm run test:flat:build:states && beefy development/ui-dev.js:bundle.js --live --open --index=./development/index.html --cwd ./",
     "mock": "beefy development/mock-dev.js:bundle.js --live --open --index=./development/index.html --cwd ./",
     "watch": "mocha watch --recursive \"test/unit/**/*.js\"",
@@ -230,6 +231,7 @@
     "@storybook/addon-info": "^3.4.2",
     "@storybook/addon-knobs": "^3.4.2",
     "@storybook/react": "^3.4.2",
+    "addons-linter": "^1.3.4",
     "babel-core": "^6.24.1",
     "babel-eslint": "^8.0.0",
     "babel-plugin-transform-async-to-generator": "^6.24.1",