Examine source code of Tab Whisper

{
  "manifest_version": 2,
  "name": "Tab Whisper",
  "version": "1.0.0",
  "description": "Save temporary notes for each browser tab locally.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-whisper@local-addon.example",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_title": "Tab Whisper",
    "default_popup": "popup.html"
  }
}