Examine source code of WaterFox

{
  "name": "WaterFox",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2021-06-06 174140.png"
    },
    "colors": {
      "frame": "rgba(40, 193, 224, 1)",
      "tab_background_text": "rgba(59, 165, 235, 1)",
      "toolbar": "rgba(120, 179, 255, 1)",
      "bookmark_text": "rgba(0, 17, 255, 1)",
      "toolbar_field": "rgba(48, 40, 138, 1)",
      "toolbar_field_text": "rgba(68, 86, 161, 1)",
      "tab_line": "rgba(135, 255, 237, 1)"
    }
  }
}