Examine source code of Tourmaline

{
  "theme": {
    "images": {
      "theme_frame": "th.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Tourmaline",
  "manifest_version": 2,
  "description": "Elbaite Tourmaline, of course.  I used the same background that I created for Sunset Quartz, and tried many other color gradients on it.  In the end, I liked this one the best, and it has been active on my personal computer for some time."
}