Examine source code of OnionFox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "DarkFox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-032-c7f80ac9e21af771c8d088973b1309ea.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(229, 137, 255)",
      "frame": "rgb(44, 33, 49)",
      "tab_background_text": "rgb(180, 112, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(224, 196, 255)",
      "tab_line": "rgb(146, 0, 165)",
      "popup": "rgb(113, 47, 131)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(210, 53, 255)",
      "icons_attention": "rgb(133, 54, 158)",
      "tab_loading": "rgb(146, 0, 165)"
    }
  }
}