Examine source code of Quick Kanban

{
  "manifest_version": 2,
  "name": "Quick Kanban",
  "version": "1.3",
  "description": "A simple Kanban board to organize tasks quickly inside your browser.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Quick Kanban"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{358edbbd-30ef-48fc-a84e-be4a727a37a8}"
    }
  }
}