Examine source code of NNote

{
  "manifest_version": 2,
  "name": "NNote",
  "version": "1.3.0",
  "description": "Organize and Share your ideas with your friends from your favorite browser.",
  "icons": {
    "48": "icons/context-menu-logo-48.png",
    "96": "icons/context-menu-logo-96.png"
  },
  "permissions": [
    "storage",
    "menus",
    "activeTab",
    "tabs",
    "https://www.nnote.je/"
  ],
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/navbar-logo-48.png",
      "96": "icons/navbar-logo-96.png"
    },
    "default_title": "NNote",
    "default_popup": "section/menu.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "info@nnote.je"
    }
  }
}