Examine source code of Quick Notes V4

{
  "manifest_version": 2,
  "name": "Quick Notes",
  "version": "1.0",
  "description": "A quick and easy way to jot down notes and ideas.",
  "icons": {
    "48": "icons/notes-icon-48.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/notes-icon-48.png",
    "default_popup": "notes-popup.html",
    "default_title": "Quick Notes"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21701728-70d7-430b-a460-f3fd609ef52e}"
    }
  }
}