Examine source code of ff2mpv-ytdlformat

{
  "description": "Tries to play links in MPV",
  "manifest_version": 2,
  "name": "ff2mpv",
  "version": "3.4",
  "icons": {
    "16": "icons/icon_16x16.png",
    "32": "icons/icon_32x32.png",
    "48": "icons/icon_48x48.png",
    "64": "icons/icon_64x64.png",
    "256": "icons/icon_256x256.png"
  },
  "browser_action": {
    "default_icon": "icons/icon_48x48.png",
    "default_title": "Play the current URL in MPV"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+V"
      },
      "description": "Play the current URL in mpv"
    }
  },
  "applications": {
    "gecko": {
      "id": "ff2mpv@girondi.net",
      "strict_min_version": "50.0"
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "ff2mpv.js"
    ]
  },
  "permissions": [
    "nativeMessaging",
    "contextMenus",
    "activeTab",
    "storage"
  ]
}