Examine source code of Skillshare Player Control

{
  "manifest_version": 3,
  "name": "Skillshare Player Control",
  "description": "Basic keyboard controls for the Skillshare player.",
  "version": "2.1.28",
  "homepage_url": "https://github.com/avi12/skillshare-player-control",
  "author": "Avi <avi6106@gmail.com>",
  "browser_specific_settings": {
    "gecko": {
      "id": "Skillshare_player_controller@gmail.com"
    }
  },
  "developer": {
    "name": "Avi",
    "url": "https://github.com/avi12/skillshare-player-control"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.skillshare.com/*"
      ],
      "js": [
        "content-scripts/skillshare.js"
      ]
    }
  ]
}