Examine source code of Tab Focus Sync

{
  "manifest_version": 3,
  "name": "Tab Focus Sync",
  "version": "1.1.0",
  "description": "Sends focused tab info to the tracker hub, for tracking the time spend on each tab.",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "48": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "dist/background.bundle.js"
    ],
    "type": "module"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-focus-sync@clusterat.com",
      "strict_min_version": "132.0"
    }
  }
}