Examine source code of RossoNero

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "RossoNero",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(191, 97, 106)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(23, 27, 38)",
      "tab_background_text": "rgb(94, 172, 161)",
      "toolbar_field": "rgb(23, 27, 38)",
      "toolbar_field_text": "rgb(94, 129, 172)",
      "tab_line": "rgb(58, 70, 102)",
      "popup": "rgb(191, 97, 106)",
      "popup_text": "rgb(47, 52, 45)",
      "button_background_active": "rgba(191, 97, 106, 0.45)",
      "frame_inactive": "rgb(23, 27, 38)",
      "icons_attention": "rgb(99, 174, 72)",
      "icons": "rgb(58, 70, 102)",
      "ntp_text": "rgb(120, 172, 100)",
      "popup_border": "rgb(0, 0, 0)",
      "popup_highlight": "rgb(0, 0, 0)",
      "sidebar_border": "rgb(191, 97, 106)",
      "sidebar_highlight_text": "rgb(94, 129, 172)",
      "sidebar_highlight": "rgb(94, 129, 172)",
      "sidebar_text": "rgb(191, 97, 106)",
      "tab_loading": "rgb(58, 70, 102)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fbf1f6c4-f118-479e-b5aa-e6b51037cc92}"
    }
  }
}