Examine source code of elegant grey

{
  "theme": {
    "images": {
      "theme_frame": "persona_head.jpg"
    },
    "colors": {
      "frame": "#7d7d7d",
      "tab_background_text": "#4a0000"
    }
  },
  "version": "2.0",
  "name": "elegant grey",
  "manifest_version": 2,
  "description": "this is a simple dark grey to black"
}