Examine source code of Volume Control

{
  "manifest_version": 2,
  "name": "Volume Control",
  "version": "1.0.7",
  "description": "Allows volume control of audio and video elements in browser tabs.",
  "homepage_url": "https://github.com/Abev08/VolumeControlExtension",
  "icons": {
    "32": "icons/icon_32.png",
    "64": "icons/icon_64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{268d28fc-7dcb-49c6-9079-80363a9bc3fe}",
      "strict_min_version": "114.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon_32.png",
      "64": "icons/icon_64.png"
    },
    "default_title": "Volume Control",
    "default_popup": "index.html"
  }
}