Examine source code of StarTron

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "StarTron",
  "manifest_version": 2,
  "description": ":3 my personal art. this is one of my robots. this is a free to use FIREFOX theme. not to be used as anything but a firefox theme."
}