--- a/browser/themes/shared/browser.inc.css
+++ b/browser/themes/shared/browser.inc.css
@@ -17,16 +17,21 @@
 :root[extradragspace][tabsintitlebar]:not([inFullscreen]) {
   --space-above-tabbar: 8px;
 }
 
 :root[sessionrestored]:-moz-lwtheme {
   transition: @themeTransition@;
 }
 
+/* Increase contrast of UI links on dark themes */
+:root[lwt-popup-brighttext] panel .text-link {
+  color: #45a1ff;
+}
+
 /* Toolbar / content area border */
 
 #navigator-toolbox::after {
   content: "";
   display: -moz-box;
   border-bottom: 1px solid var(--toolbox-border-bottom-color);
 }