Examine source code of EasyPad

{
  "manifest_version": 2,
  "name": "EasyPad",
  "version": "1.3",
  "description": "Simple notepad for firefox",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "EasyPad",
    "default_popup": "easypad.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "theme"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8fabe50b-0f44-41f3-9862-0915c8746b94}"
    }
  }
}