Examine source code of Firefox Stargate

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#4c87d4",
      "tab_background_text": "#2cc9b7"
    }
  },
  "version": "2.0",
  "name": "Firefox Stargate",
  "manifest_version": 2,
  "description": "A Stargate theme with a touch of Firefox. Wanted a Stargate theme with some indication of the Firefox and here it is. So cute in my opinion."
}