Examine source code of Proton Google Chrome Dark

{
  "name": "Proton Google Chrome Dark",
  "author": "zhangtianli",
  "description": "A tweak to Google Chrome Dark Theme to adapt Proton Design.",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "colors": {
      "frame": "rgba(32, 33, 36, 1)",
      "frame_inactive": "rgba(60, 64, 67, 1)",
      "tab_background_text": "rgba(189, 193, 198, 1)",
      "tab_background_separator": "rgba(134, 137, 142, 1)",
      "tab_text": "rgba(214, 215, 215, 1)",
      "tab_line": "rgba(50, 54, 57, 1)",
      "tab_loading": "rgba(214, 215, 215, 1)",
      "tab_selected": "rgba(50, 54, 57, 1)",
      "icons": "rgba(214, 215, 215, 1)",
      "icons_attention": "rgba(138, 180, 248, 1)",
      "toolbar": "rgba(50, 54, 57, 1)",
      "bookmark_text": "rgba(214, 215, 215, 1)",
      "toolbar_top_separator": "transparent",
      "toolbar_bottom_separator": "transparent",
      "toolbar_vertical_separator": "transparent",
      "toolbar_field": "rgba(40, 44, 47, 1)",
      "toolbar_field_text": "rgba(214, 215, 215, 1)",
      "toolbar_field_text_focus": "rgba(214, 215, 215, 1)",
      "toolbar_field_highlight": "rgba(32, 95, 181, 1)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255, 1)",
      "toolbar_field_focus": "rgba(60, 64, 67, 1)",
      "toolbar_field_border": "transparent",
      "toolbar_field_border_focus": "rgba(91, 110, 139, 1)",
      "button_background_hover": "rgba(66, 70, 73, 1)",
      "button_background_active": "rgba(77, 81, 83, 1)",
      "popup": "rgba(40, 44, 47, 1)",
      "popup_text": "rgba(214, 215, 215, 1)",
      "popup_border": "transparent",
      "popup_highlight": "#474b4e",
      "popup_highlight_text": "rgba(255, 255, 255, 1)",
      "ntp_background": "rgba(50, 54, 57, 1)",
      "ntp_text": "rgba(214, 215, 215, 1)",
      "sidebar": "rgba(40, 44, 47, 1)",
      "sidebar_border": "rgba(40, 44, 47, 1)",
      "sidebar_text": "rgba(214, 215, 215, 1)",
      "sidebar_highlight": "#474b4e",
      "sidebar_highlight_text": "rgba(255, 255, 255, 1)"
    }
  }
}