Examine source code of SaveYourData

{
  "theme": {
    "images": {
      "theme_frame": "FireFoxPersona-Header.jpg"
    },
    "colors": {
      "frame": "#5aa6e8",
      "tab_background_text": "#faf5f5"
    }
  },
  "version": "2.0",
  "name": "SaveYourData",
  "manifest_version": 2,
  "description": "Save Your Data with <a href=\"https://outgoing.prod.mozaws.net/v1/b87e16bfb0ef1684566c9ab2833b1f9fc97fb1636a204c0392a76d423b0962a0/http%3A//www.saveyourdata.biz\" rel=\"nofollow\">www.saveyourdata.biz</a>.  We backup and restore with byte-by-byte accuracy."
}