Examine source code of MCBBS Extender

{
  "manifest_version": 2,
  "name": "MCBBS Extender",
  "version": "2.2.2",
  "description": "优化, 美化MCBBS v2体验",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://*.mcbbs.net/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "inject.js"
  ],
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/border-48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{896bda9c-4e5b-4210-83e3-cb8cf4be25ef}"
    }
  }
}