Examine source code of FastFrame Capture

{
  "manifest_version": 2,
  "name": "FastFrame Capture",
  "version": "1.0.0",
  "description": "Capture high-quality frames from online videos instantly using a keyboard shortcut.",
  "permissions": [
    "activeTab",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "capture-frame": {
      "suggested_key": {
        "default": "Ctrl+Shift+S"
      },
      "description": "Capture current video frame"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "fastframe-capture@amo.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}