Examine source code of My Notes

{
  "description": "My Notes it is a similar sticky notes add-on for Firefox",
  "manifest_version": 2,
  "name": "My Notes",
  "version": "4.2.1",
  "homepage_url": "http://www.inframe.ro",
  "icons": {
    "32": "logo_32.png",
    "48": "logo_48.png",
    "64": "logo_64.png",
    "128": "logo_128.png"
  },
  "browser_action": {
    "default_icon": "logo_32.png",
    "default_title": "My Notes",
    "default_popup": "mynotes.html"
  },
  "permissions": [
    "storage"
  ]
}