Examine source code of block-bx-addons

{
  "manifest_version": 2,
  "name": "block-bx-addons",
  "description": "block 'baidu.com',\n    'sogou.com',\n    'jd.com',\n    'taobao.com',\n    'sohu.com',\n    'weibo.com',\n    'iqiyi.com',\n    'toutiao.com',\n    'qidian.com',\n    'qdmm.com',\n    'hongxiu.com',\n    'douban.com',\n    'zhihu.com',\n    'sina.com',\n    'qq.com',",
  "version": "0.0.1.1",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "block-bx-addons@example.com"
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs",
    "webNavigation"
  ],
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/search*"
      ],
      "js": [
        "js/google.js"
      ]
    },
    {
      "matches": [
        "*://*.bing.com/search*"
      ],
      "js": [
        "js/bing.js"
      ]
    }
  ]
}