Examine source code of Abyss(t17)

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#c0c0c0"
    }
  },
  "version": "2.0",
  "name": "Abyss(t17)",
  "manifest_version": 2,
  "description": "The goal was to create a simple theme, dominated by the color black. Some smoke gradients were added to give it a little more variety."
}