Examine source code of Otimista

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Anti Light",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.85)",
      "toolbar_text": "rgb(161, 210, 212)",
      "frame": "rgb(8, 18, 25)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(0, 0, 0, 0.2)",
      "toolbar_field_text": "rgb(253, 253, 253)",
      "tab_line": "rgb(38, 178, 184)",
      "popup": "rgba(3, 18, 28, 0.57)",
      "popup_text": "rgb(211, 225, 226)",
      "icons_attention": "rgba(175, 146, 208, 0.93)",
      "icons": "rgb(38, 178, 184)",
      "sidebar_border": "rgb(38, 178, 184)",
      "tab_loading": "rgb(255, 183, 86)",
      "toolbar_field_border_focus": "rgb(38, 178, 184)",
      "toolbar_field_focus": "rgba(0, 0, 0, 0.84)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255, 0.93)"
    }
  }
}