manifest.json

{
  "name": "Email Destroyer",
  "version": "1.0.0",
  "manifest_version": 2,
  "icons": {
    "16": "assets/icons/icon-16.png",
    "38": "assets/icons/icon-32.png",
    "128": "assets/icons/icon-128.png"
  },

 /* "default_locale": "en",*/
  "background": {
    "scripts": [
      "assets/js/angular.min.js",
      "assets/js/script.js",
      "assets/js/storage.service.js"    
    ],
    "css": ["assets/style/style.css"],
    "persistent": false
  },
"permissions": [
    "https://cdnjs.cloudflare.com/*",
    "https://fonts.googleapis.com/*",
    "tabs",
     "activeTab"
],
 "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "assets/js/jquery-3.1.1.min.js",
        "assets/js/content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": "assets/icons/icon-20.png",
    "default_popup": "index.html"
  }
}