Examine source code of Addiction away

{
  "manifest_version": 2,
  "name": "Addiction away",
  "version": "1.0.1",
  "description": "Removes parts of website which may have cause you to go on a rabbit hole, like an youtube main page, facebook feed and so on.",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "youtube.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "css": [
        "facebook.css"
      ],
      "js": [
        "facebook.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{456b4869-41f2-45c0-b823-75300160bb41}"
    }
  }
}