Examine source code of KT_ScreenRecorder

{
  "manifest_version": 2,
  "name": "Screen Recorder",
  "version": "1.0",
  "description": "Record your screen and audio",
  "permissions": [
    "screenshots",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f351112-bb69-4c8c-bd5b-82c577b8d1ef}"
    }
  }
}