Examine source code of Trinkey-ify Youtube

{
  "manifest_version": 2,
  "name": "Trinkey-ify Youtube",
  "version": "0.2",
  "description": "Adds my cat to all youtube thumbnails",
  "icons": {
    "48": "assets/icons/icon-48.png",
    "96": "assets/icons/icon-96.png"
  },
  "permissions": [
    "*://www.youtube.com/*",
    "storage"
  ],
  "web_accessible_resources": [
    "assets/images/trinkey/*.png",
    "assets/images/taylor/*.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "popup.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "youtubecat@trinkey",
      "strict_min_version": "48.0"
    }
  }
}