Examine source code of TogglSync

{
  "manifest_version": 3,
  "name": "TogglSync",
  "version": "3.0.3",
  "description": "Synchronizace Toggl záznamů do Úkolovníku",
  "permissions": [
    "cookies",
    "storage",
    "activeTab",
    "alarms"
  ],
  "host_permissions": [
    "https://ukol.svetit.cz/*",
    "http://ukol.svetit.cz/*",
    "*://*.svetit.cz/*",
    "https://90.183.52.114:5001/*",
    "https://localhost:5001/*",
    "https://togglsync.svetit.cz/*",
    "https://127.0.0.1:5001/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "togglsyncaddon@svetit.cz",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "action": {
    "default_popup": "popup.html"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "icons": {
    "128": "icon.png"
  }
}