Examine source code of MrTheme-Dark

{
  "theme": {
    "images": {
      "theme_frame": "mrtheme_persona_header.png"
    },
    "colors": {
      "frame": "#ff00f2",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "MrTheme-Dark",
  "manifest_version": 2,
  "description": "Based on the design of <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/3281ba27ad37022f18d8dc7497242d348b741e982368764402eef2ecd687f889/http%3A//www.mrtheme.com\">http://www.mrtheme.com</a>"
}