Examine source code of motherjane black

{
  "theme": {
    "images": {
      "theme_frame": "persona_header.jpg"
    },
    "colors": {
      "frame": "#b5b5b5",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "motherjane black",
  "manifest_version": 2,
  "description": "Another persona from motherjane.\nAgain, thanks a lot to the Personas feature in Firefox."
}