Examine source code of Open in Player

{
  "manifest_version": 2,
  "name": "Open in Player",
  "version": "0.3.5",
  "description": "Open URLs (video) in mpv, vlc, etc",
  "icons": {
    "128": "ico/video.png"
  },
  "browser_action": {
    "default_icon": "ico/video.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "permissions": [
    "tabs",
    "storage",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2b3a3790-9e66-4280-8000-7ca43b0e2c75}"
    }
  }
}