Examine source code of tommi.space grayscale

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "tommi.space greyscale",
  "theme": {
    "colors": {
      "toolbar": "rgb(27, 27, 27)",
      "toolbar_text": "rgba(255, 255, 255, 0.6)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(209, 209, 209)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.9)",
      "tab_line": "rgba(0, 0, 0, 0)",
      "popup": "rgb(50, 50, 50)",
      "popup_text": "rgb(238, 238, 238)",
      "button_background_active": "rgba(255, 255, 255, 0.25)",
      "button_background_hover": "rgba(255, 255, 255, 0.1)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons_attention": "rgba(255, 255, 255, 0.35)",
      "icons": "rgba(255, 255, 255, 0.35)",
      "ntp_background": "rgb(27, 27, 27)",
      "ntp_text": "rgba(255, 255, 255, 0.9)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "popup_highlight_text": "rgba(0, 0, 0, 0)",
      "popup_highlight": "rgba(0, 0, 0, 0)",
      "sidebar_border": "rgba(0, 0, 0, 0)",
      "sidebar_highlight_text": "rgb(39, 39, 39)",
      "sidebar_highlight": "rgb(252, 201, 32)",
      "sidebar_text": "rgba(255, 255, 255, 0.9)",
      "sidebar": "rgb(39, 39, 39)",
      "tab_background_separator": "rgba(221, 221, 221, 0)",
      "tab_loading": "rgba(255, 255, 255, 0.35)",
      "tab_selected": "rgba(0, 0, 0, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(27, 27, 27)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_border": "rgba(0, 0, 0, 0)",
      "toolbar_field_focus": "rgb(50, 50, 50)",
      "toolbar_field_highlight_text": "rgb(27, 27, 27)",
      "toolbar_field_highlight": "rgb(252, 201, 32)",
      "toolbar_field_separator": "rgba(0, 0, 0, 0)",
      "toolbar_field_text_focus": "rgb(238, 238, 238)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "toolbar_vertical_separator": "rgba(0, 0, 0, 0)"
    }
  }
}