Examine source code of CleanYT

{
  "manifest_version": 2,
  "name": "CleanYT",
  "version": "2.0",
  "description": "Will hide comments or comment replies on youtube containing words that you blacklisted. To declare blacklisted words just go into the addon settings and add them into the textfield. Separate them by comma. Words are case insensitive. Get rid of the 'still watching in 2020' comments!",
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/watch*"
      ],
      "js": [
        "cleanyt.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "{f66160b8-4481-11ea-b77f-2e728ce88125}"
    }
  }
}