Examine source code of CoverWeb

{
  "manifest_version": 2,
  "name": "CoverWeb",
  "description": "__MSG_ext_description__",
  "version": "1.0.39.20",
  "default_locale": "en",
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "css": [
        "build/css/screen.css"
      ],
      "js": [
        "build/js/app.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "build/css/*.css",
    "build/img/*.png",
    "img/*.gif",
    "img/*.png",
    "img/brands/*.png",
    "img/brands/*.svg",
    "js/*.html"
  ],
  "background": {
    "scripts": [
      "build/js/bg.js"
    ]
  },
  "browser_action": {
    "default_title": "Click to enable or disable panel"
  },
  "permissions": [
    "tabs",
    "storage",
    "notifications",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "<all_urls>",
    "*://*/*"
  ]
}