Examine source code of TUFExtension

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.0.4",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "https://www.youtube.com/*",
    "https://i.ytimg.com/*",
    "https://www.bilibili.com/*",
    "https://tuforums.com/*",
    "https://*.tuforums.com/*"
  ],
  "web_accessible_resources": [
    "fonts/*",
    "twemoji/flags/*.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tufextension@tuforums.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.bilibili.com/*",
        "https://www.youtube.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  }
}