--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -517,16 +517,20 @@ toolbar:not(#TabsToolbar) > #personal-bo
 #PopupAutoComplete > richlistbox > richlistitem > .ac-type-icon,
 #PopupAutoComplete > richlistbox > richlistitem > .ac-site-icon,
 #PopupAutoComplete > richlistbox > richlistitem > .ac-tags,
 #PopupAutoComplete > richlistbox > richlistitem > .ac-separator,
 #PopupAutoComplete > richlistbox > richlistitem > .ac-url {
   display: none;
 }
 
+#PopupAutoComplete[firstresultstyle="insecureWarning"] {
+  min-width: 200px;
+}
+
 #PopupAutoComplete > richlistbox > richlistitem[originaltype="insecureWarning"] {
   -moz-binding: url("chrome://global/content/bindings/autocomplete.xml#autocomplete-richlistitem-insecure-field");
   height: auto;
 }
 
 #PopupAutoComplete > richlistbox > richlistitem[originaltype="insecureWarning"] > .ac-site-icon {
   display: initial;
 }