Examine source code of Gearbest.com button

{
  "manifest_version": 2,
  "version": "1.0.3resigned1",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "icons/gb-48.png",
    "96": "icons/gb-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/gb-16.png",
    "default_title": "__MSG_browserActionTitle__"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{04b837e1-bf4d-42e5-b548-cd8b420ac616}"
    }
  }
}