Examine source code of Screen Time Tracker

{
  "manifest_version": 2,
  "name": "Screen Time Tracker",
  "version": "1.0",
  "description": "Track your screen time.",
  "icons": {
    "48": "logo.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "logo.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3077f398-3a9d-48ee-a08f-2b3968389bb7}"
    }
  }
}