Examine source code of nextTab >

{
  "manifest_version": 2,
  "name": "nextTab >",
  "version": "2.0.2resigned1",
  "description": "Next tab only a click away!",
  "icons": {
    "48": "icons/button-48.png",
    "96": "icons/button-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/button-48.png",
      "96": "icons/button-96.png"
    },
    "default_title": "nextTab >"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a046161-0874-46de-aeeb-b25104ea62bb}"
    }
  }
}