Examine source code of Outer Wilds UI

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Outer Wilds UI",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(61, 84, 119)",
      "toolbar_text": "rgb(229, 164, 104)",
      "frame": "rgb(16, 19, 23)",
      "tab_background_text": "rgb(170, 226, 240)",
      "toolbar_field": "rgb(32, 49, 75)",
      "toolbar_field_text": "rgb(229, 164, 104)",
      "tab_line": "rgb(229, 164, 104)",
      "popup": "rgb(48, 66, 95)",
      "popup_text": "rgb(233, 172, 110)",
      "button_background_active": "rgb(229, 164, 104)",
      "button_background_hover": "rgb(52, 71, 102)",
      "icons": "rgb(170, 226, 240)",
      "ntp_background": "rgb(16, 19, 23)",
      "ntp_text": "rgb(170, 226, 240)",
      "popup_border": "rgb(229, 164, 104)",
      "tab_loading": "rgb(111, 83, 121)",
      "tab_selected": "rgb(16, 19, 23)",
      "tab_text": "rgb(229, 164, 104)",
      "toolbar_field_border_focus": "rgb(123, 46, 150)",
      "toolbar_field_border": "rgb(93, 77, 80)",
      "toolbar_field_focus": "rgb(48, 66, 95)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7bc6f40d-d874-4994-bc7a-a2334f5090d7}"
    }
  }
}