Examine source code of SlideMaster

{
  "manifest_version": 2,
  "name": "SlideMaster",
  "version": "1.0",
  "author": "Robinson J",
  "description": "Have control over Google Slides",
  "homepage_url": "https://github.com/CodesWithRobi/SlideMaster",
  "icons": {
    "16": "icons/fullscreen16.png",
    "32": "icons/fullscreen32.png",
    "48": "icons/fullscreen48.png",
    "128": "icons/fullscreen128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://docs.google.com/presentation/d/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "/icons/fullscreen.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rayercodes@gmail.com"
    }
  }
}