Examine source code of Ending-skipper

{
  "manifest_version": 2,
  "name": "Ending-skipper",
  "version": "1.0.0",
  "description": "This is a Firefox extension to automatically skip the credits(ending) of an anime and start the next episode on the 'jut.su' site.",
  "homepage_url": "https://github.com/DmEye/ending-skipper",
  "icons": {
    "48": "icons/ending-skipper-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://jut.su/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f998290-7bb7-4ba5-8324-d76f22cb81d5}"
    }
  }
}