Examine source code of OV supporter

{
  "manifest_version": 3,
  "name": "OV supporter",
  "description": "OV supporter",
  "version": "1.5.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "admin@thebien.net",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "type": "module"
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "default_popup": "popup.html",
    "default_title": "OV supporter"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "commands": {
    "toggle-audio": {
      "suggested_key": {
        "default": "Alt+Shift+M"
      },
      "description": "Toggle audio mute/unmute"
    },
    "back-to-seat": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description": "Back to my seat"
    },
    "leave-room": {
      "suggested_key": {
        "default": "Alt+Shift+Q"
      },
      "description": "Leave room"
    },
    "toggle-meet-audio": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "Toggle Google Meet audio mute/unmute"
    }
  }
}