Examine source code of anticlose

{
  "manifest_version": 2,
  "name": "AntiClose",
  "description": "Remove barriers when using the web",
  "version": "0.0.6",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://blog.csdn.net/*"
      ],
      "js": [
        "enable_copy.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b1caf56-0658-4343-acf0-fe67fe99bbcb}"
    }
  }
}