--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@@ -1134,35 +1134,35 @@ notification[value="translation"] menuli
   border: 1px solid transparent;
 }
 
 .autocomplete-richlistitem[selected=true] {
   background-color: Highlight;
 }
 
 .ac-title {
-  font-size: 14px;
+  font-size: 1.05em;
 }
 
 .ac-tags {
-  font-size: 12px;
+  font-size: 0.9em;
 }
 
 html|span.ac-tag {
   background-color: MenuText;
   color: Menu;
   border-radius: 2px;
   border: 1px solid transparent;
   padding: 0 1px;
 }
 
 .ac-separator,
 .ac-url,
 .ac-action {
-  font-size: 12px;
+  font-size: 0.9em;
   color: -moz-nativehyperlinktext;
 }
 
 .ac-title[selected=true],
 .ac-separator[selected],
 .ac-url[selected=true],
 .ac-action[selected=true] {
   color: inherit !important;