Examine source code of GNOME Light Theme

{
  "name": "GNOME Light Theme",
  "manifest_version": 2,
  "version": "2.3",
  "applications": {
    "gecko": {
      "id": "gnome-light-theme@weijarz",
      "strict_min_version": "60.0"
    }
  },
  "theme": {
    "colors": {
      "tab_background_text": "#f4f4f4",
      "frame": "#6B7070",
      "tab_background_separator": "#CCC6C1",
      "tab_loading": "#af4448",
      "icons_attention": "#af4448",
      "ntp_background": "#F6F5F4",
      "ntp_text": "#323739",
      "toolbar": "#DCD9D5",
      "bookmark_text": "#323739",
      "toolbar_top_separator": "#4E5252",
      "toolbar_bottom_separator": "#BEB7B0",
      "toolbar_vertical_separator": "#b4b4b4",
      "toolbar_field": "#F6F5F4",
      "toolbar_field_text": "#323739",
      "toolbar_field_border": "#CCC6C1",
      "toolbar_field_border_focus": "#3883E3",
      "toolbar_field_focus": "#fff",
      "button_background_hover": "#F1EFED",
      "button_background_active": "#CEC9C3",
      "popup": "#fff",
      "popup_text": "#323739",
      "popup_highlight": "#3883E3",
      "popup_highlight_text": "#fff",
      "sidebar": "#FBFAFA",
      "sidebar_border": "#CCC6C1",
      "sidebar_highlight": "#3883E3",
      "sidebar_highlight_text": "#fff"
    }
  }
}