diff --git a/toolkit/themes/pinstripe/help/helpFileLayout.css b/toolkit/themes/pinstripe/help/helpFileLayout.css
index ab0e9a3831e..f8879e3a040 100644
--- a/toolkit/themes/pinstripe/help/helpFileLayout.css
+++ b/toolkit/themes/pinstripe/help/helpFileLayout.css
@@ -45,7 +45,10 @@ body {
 	max-width: 120ex;
 }
 
-:link:hover { color: red; }
+:link:hover,
+:visited:hover {
+  color: -moz-activehyperlinktext;
+}
 
 a[href^="http://"]:after,
 a[href^="https://"]:after {
diff --git a/toolkit/themes/winstripe/help/helpFileLayout.css b/toolkit/themes/winstripe/help/helpFileLayout.css
index 58adbca466f..48ce310a541 100644
--- a/toolkit/themes/winstripe/help/helpFileLayout.css
+++ b/toolkit/themes/winstripe/help/helpFileLayout.css
@@ -45,7 +45,10 @@ body {
 	max-width: 120ex;
 }
 
-:link:hover { color: red; }
+:link:hover,
+:visited:hover {
+  color: -moz-activehyperlinktext;
+}
 
 a[href^="http://"]:after,
 a[href^="https://"]:after {