Examine source code of Screencastify Enhanced

{
  "manifest_version": 2,
  "name": "Screencastify Enhanced",
  "version": "2.0",
  "description": "Record tab, screen, window, webcam, and microphone.",
  "permissions": [
    "activeTab",
    "tabs",
    "tabCapture"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/logo_64.png"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d13b7930-2d8c-47fc-ac94-0797f08c521a}"
    }
  }
}