Examine source code of notetab

{
  "manifest_version": 2,
  "name": "notes",
  "version": "1.0",
  "description": "A minimalist tool for your notes, so you won't forget anything.",
  "permissions": [
    "<all_urls>",
    "tabs",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "notes@inyourbrowser.com"
    }
  },
  "icons": {
    "48": "icon/icon_48.png",
    "96": "icon/icon_96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icon/icon_48.png",
      "96": "icon/icon_96.png"
    },
    "default_title": "Notes"
  }
}