Examine source code of B Theme Remix

{
  "theme": {
    "images": {
      "theme_frame": "oben.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "B Theme Remix",
  "manifest_version": 2,
  "description": "Inspirated by the \"Firefox B\" Persona. I just used the new Firefox logo and added a bar on the top for the menu + bookmarks."
}