Examine source code of Dark Fox

{
  "name": "Dark Fox",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Firefox_Focus_Logo,_2018.png"
    },
    "colors": {
      "frame": "rgba(12, 13, 15, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(105, 78, 78, 1)",
      "bookmark_text": "rgba(209, 170, 170, 1)",
      "toolbar_field": "rgba(135, 46, 46, 1)",
      "toolbar_field_text": "rgba(148, 48, 48, 1)"
    }
  }
}