Examine source code of Per-Tab Volume Controller

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "2.0.1",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "contextMenus",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background-ff.js"
    ]
  },
  "action": {
    "default_title": "Volume",
    "default_popup": "src/ui/popup/popup.html"
  },
  "options_ui": {
    "page": "src/ui/options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "src/assets/icons/icon48.png",
    "128": "src/assets/icons/icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "assets/content.ts-loader.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "assets/*",
        "assets/browser-polyfill.js",
        "assets/content.ts.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "volume-controller@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}