Examine source code of John Wick 4

{
  "manifest_version": 2,
  "version": "2",
  "name": "wick-dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.31)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(191, 2, 2, 0.47)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(30, 30, 30)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(185, 4, 4)",
      "button_background_hover": "rgb(105, 12, 12)",
      "frame_inactive": "rgb(108, 108, 108)",
      "ntp_background": "rgba(98, 103, 105, 0.21)",
      "popup_border": "rgb(255, 255, 255)",
      "popup_highlight_text": "rgba(67, 7, 7, 0.91)",
      "popup_highlight": "rgb(143, 143, 143)",
      "sidebar_border": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(127, 2, 2)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(30, 30, 30)",
      "tab_background_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgba(135, 3, 0, 0.82)",
      "tab_selected": "rgba(157, 1, 1, 0.61)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgba(34, 34, 34, 0.79)",
      "toolbar_field_border": "rgb(134, 3, 3)",
      "toolbar_field_focus": "rgba(0, 0, 0, 0.84)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(96, 98, 98)",
      "toolbar_field_separator": "rgb(0, 0, 0)",
      "toolbar_field_text_focus": "rgba(0, 0, 0, 0)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "toolbar_vertical_separator": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4002ddc5-ebe1-474c-9302-7c23cd624112}"
    }
  }
}