Examine source code of TimeTrack

{
  "manifest_version": 2,
  "name": "TimeTrack",
  "version": "0.4.0.3",
  "description": "Helps you limit time you spend procrastinating on the internet",
  "permissions": [
    "storage",
    "tabs"
  ],
  "optional_permissions": [
    "downloads",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "timetrack@carcinizer",
      "strict_min_version": "69.0"
    }
  },
  "background": {
    "page": "src/background.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "TimeTrack",
    "default_popup": "src/menu.html"
  }
}