Examine source code of Sims 4 UI

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Sims 4 UI (New)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.1)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(9, 73, 171)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 205, 0)",
      "popup": "rgba(255, 255, 255, 0.8)",
      "popup_text": "rgb(9, 73, 171)",
      "button_background_active": "rgba(0, 205, 0, 0.33)",
      "frame_inactive": "rgb(159, 159, 159)",
      "ntp_background": "rgb(163, 178, 196)",
      "popup_border": "rgb(0, 205, 0)",
      "tab_background_separator": "rgb(0, 205, 0)",
      "tab_loading": "rgb(56, 161, 242)",
      "tab_selected": "rgb(0, 205, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0.3)",
      "toolbar_field_border_focus": "rgb(0, 205, 0)",
      "toolbar_field_highlight": "rgb(56, 161, 242)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0.5)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{43769332-be22-4ac6-98fa-701641434d10}"
    }
  }
}