Examine source code of V2EX Stats

{
  "manifest_version": 2,
  "name": "V2EX Stats",
  "description": "V2EX 统计",
  "version": "3.2.3",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage"
  ],
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAutX6DFhQWKNePMfj3ScxxYYp6QLSDrKgI8KbE5l3BuMwa/+w8mX46bubxRh6EQcOxZ/55oVd5NJmMKgpWzNLhF6dkSowllG2frYSjnFxpRrChV3wdPBZ+nEX099iG/XNqDWgqhvDDxTbFOSRzklSqkQFJDYDicqr6zxvnZOZ2kbzsBx3e3QplACmHQiT7SwlXYKsKV9USr+b7flMR0JJUxlhHkPjoUs2CUy756nl6QwMS191ZKgN2tsZXNf8Uik3XGXlYDL+YEqOB2qila2KOZoQlVNP29ErtHCmglohvLGMW6K65R9BubPIDRiAv57AZbJWEWt79QDAtXxpuTSjIQIDAQAB",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://cn.v2ex.com/*",
        "*://de.v2ex.com/*",
        "*://fast.v2ex.com/*",
        "*://global.v2ex.com/*",
        "*://hk.v2ex.com/*",
        "*://jp.v2ex.com/*",
        "*://origin.v2ex.com/*",
        "*://s.v2ex.com/*",
        "*://staging.v2ex.com/*",
        "*://us.v2ex.com/*",
        "*://v2ex.com/*",
        "*://www.v2ex.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{2ff4e91f-94e0-44eb-8ebc-e86bb60ceccb}"
    }
  }
}