Examine source code of OMGupload

{
  "theme": {
    "images": {
      "theme_frame": "firefox.png"
    },
    "colors": {
      "frame": "#449fff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "OMGupload",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/44755f021320e02ca4d224d6ee64a3347ca8fa19d3a946984e807e198c5aed83/http%3A//OMGupload.com\" rel=\"nofollow\">OMGupload.com</a>"
}