Examine source code of Tab Sharer

{
  "manifest_version": 3,
  "name": "Tab Sharer",
  "version": "1.0.0",
  "description": "Select tabs and share them via email.",
  "action": {
    "default_popup": "popup.html",
    "default_title": "Share Tabs"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "icons": {
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-sharer@example.com",
      "strict_min_version": "109.0"
    }
  }
}