Examine source code of Not Yet Remembered

{
  "theme": {
    "images": {
      "theme_frame": "bwhead.png"
    },
    "colors": {
      "frame": "#8a8a8a",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Not Yet Remembered",
  "manifest_version": 2,
  "description": "Simple and clean. A dark wood background with light text."
}