Examine source code of Dark Uniform V6

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Uniform V6",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(67, 75, 75)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(93, 101, 101)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(67, 75, 75)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(18, 127, 48)",
      "popup": "rgb(101, 111, 113)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(87, 188, 115, 0.7)",
      "button_background_hover": "rgba(18, 127, 48, 0.7)",
      "icons_attention": "rgb(0, 255, 200)",
      "ntp_background": "rgb(140, 145, 149)",
      "popup_border": "rgb(144, 149, 153)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgba(18, 127, 48, 0.7)",
      "sidebar_border": "rgb(140, 145, 149)",
      "sidebar_highlight_text": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgba(87, 188, 115, 0.7)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(77, 83, 83)",
      "tab_loading": "rgb(157, 175, 189)",
      "tab_selected": "rgba(18, 127, 48, 0.7)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(67, 75, 75)",
      "toolbar_field_border_focus": "rgb(67, 75, 75)",
      "toolbar_field_border": "rgb(67, 75, 75)",
      "toolbar_field_focus": "rgb(123, 138, 150)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgba(87, 188, 115, 0.7)",
      "toolbar_field_separator": "rgb(101, 111, 113)",
      "toolbar_top_separator": "rgb(67, 75, 75)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{636a0361-c105-4a92-82d4-0e70669cc571}"
    }
  }
}