Examine source code of Kanbanly

{
  "name": "Kanbanly",
  "version": "3.2.3",
  "manifest_version": 2,
  "default_locale": "en",
  "description": "Manage your Google tasks todo list with a visual Kanban board",
  "icons": {
    "16": "images/kanbanly-icon-16.png",
    "48": "images/kanbanly-icon-48.png",
    "128": "images/kanbanly-icon-128.png"
  },
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "permissions": [
    "https://www.googleapis.com/",
    "https://accounts.google.com/",
    "tabs",
    "identity",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "kanbanly@nodetics.com"
    }
  },
  "browser_action": {
    "default_icon": "images/kanbanly-icon-128.png",
    "default_title": "Kanbanly"
  }
}