Examine source code of Mike Patton -

{
  "theme": {
    "images": {
      "theme_frame": "mikepattonfirefox.png"
    },
    "colors": {
      "frame": "#4e71ed",
      "tab_background_text": "#021a6e"
    }
  },
  "version": "2.0",
  "name": "Mike Patton -",
  "manifest_version": 2,
  "description": "mike patton, faith no more, mr bungle, tomahawk, peeping tom etc"
}