Examine source code of ThumbFade

{
  "manifest_version": 2,
  "name": "Thumbfade",
  "version": "0.1.3",
  "author": "Wesley Junio",
  "description": "Fades thumbnails from sites (Only working on youtube for while)",
  "permissions": [
    "storage",
    "tabs"
  ],
  "icons": {
    "48": "./icons/tf48.png",
    "96": "./icons/tf96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "./script/script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bee865dd-467e-462d-8dac-7469a0505021}"
    }
  }
}