Examine source code of FireSeventy

{
  "name": "FireSeventy",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "0.jpg"
    },
    "colors": {
      "frame": "rgb(125, 60, 145)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar": "rgba(194, 92, 51, 0)",
      "bookmark_text": "rgb(251, 248, 251)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(239, 117, 42)"
    }
  }
}