Examine source code of Nordic Darker Theme

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "nordik-darker-theme@tiberius",
      "strict_min_version": "89.0"
    }
  },
  "name": "Nordic Darker Theme",
  "version": "2023.10.7",
  "description": "Nordic-darker GTK theme port for Firefox",
  "theme": {
    "colors": {
      "bookmark_text": "#d8dee9",
      "button_background_active": "#3b4252",
      "button_background_hover": "#3b4252",
      "frame": "#3b4252",
      "frame_inactive": "#2f343f",
      "icons": "#d8dee9",
      "icons_attention": "#ebcb8b",
      "ntp_background": "#2e3440",
      "ntp_text": "#d8dee9",
      "popup": "#3b4252",
      "popup_border": "#111318",
      "popup_highlight": "#4c566a",
      "popup_highlight_text": "#d8dee9",
      "popup_text": "#d3dae3",
      "sidebar": "#2e3440",
      "sidebar_border": "#3b4252",
      "sidebar_highlight": "#4c566a",
      "sidebar_highlight_text": "#d8dee9",
      "sidebar_text": "#d8dee9",
      "tab_background_separator": "rgba(255, 255, 255, 0.5)",
      "tab_background_text": "#d3dae3",
      "tab_line": "#d08770",
      "tab_loading": "#a3be8c",
      "tab_selected": "#2f343f",
      "tab_text": "#d8dee9",
      "toolbar": "#2e3440",
      "toolbar_bottom_separator": "#3b4252",
      "toolbar_field": "#2e3440",
      "toolbar_field_border": "#2e3440",
      "toolbar_field_border_focus": "#4c566a",
      "toolbar_field_focus": "#2e3440",
      "toolbar_field_highlight": "#4c566a",
      "toolbar_field_highlight_text": "#d8dee9",
      "toolbar_field_text": "#d8dee9",
      "toolbar_top_separator": "#3b4252",
      "toolbar_vertical_separator": "#373b45"
    }
  }
}