Examine source code of Acccept

{
  "theme": {
    "images": {
      "theme_frame": "acc.png"
    },
    "colors": {
      "frame": "#7a1200",
      "tab_background_text": "#d9bc6c"
    }
  },
  "version": "2.0",
  "name": "Acccept",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/dd6fa3e4e673f9df2831aa9f7108c858da4cf7dab9391517d9e1f7c90a8fd626/http%3A//www.acceptworldwide.com/\" rel=\"nofollow\">http://www.acceptworldwide.com/</a>"
}