Examine source code of www.2old4that.de

{
  "theme": {
    "images": {
      "theme_frame": "FireFoxHeader2old.png"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#ff0000"
    }
  },
  "version": "2.0",
  "name": "www.2old4that.de",
  "manifest_version": 2,
  "description": "2old4that Multigaming Clan (<a href=\"https://outgoing.prod.mozaws.net/v1/ea8c56b66ccec681db4cc459842e4db9dd338679a47e8f6f9e697881926addd6/http%3A//www.2old4that.de\" rel=\"nofollow\">www.2old4that.de</a>)  - Firefox Theme"
}