Examine source code of brss

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#2e2e2e"
    }
  },
  "version": "2.0",
  "name": "brss",
  "manifest_version": 2,
  "description": "Someone already did a theme like this, but there was something that I didn't like, so I've changed it a little."
}