diff --git a/chrome/content/zotero-platform/mac/overlay.css b/chrome/content/zotero-platform/mac/overlay.css
index ba5a5ae53..f31f07f5f 100644
--- a/chrome/content/zotero-platform/mac/overlay.css
+++ b/chrome/content/zotero-platform/mac/overlay.css
@@ -148,54 +148,6 @@
   padding: 5px 1px 5px 11px;
 }
 
-
-/*
- * The searchbox focus ring is incorrect in Yosemite pre-Fx34, so use the old searchbox shape
- * (with code borrowed from the Fx Add-ons window and icons borrowed from the Fx searchbar).
- * These styles, the 'oldsearchfield' assignment in zoteroPane.js, and the Search.png icons
- * can be removed after Fx31 ESR.
- *
- * Note: This uses navigator.oscpu in zoteroPane.js to test for Yosemite instead of
- * -moz-mac-yosemite-theme here because the latter isn't defined in Fx31.
- */
-#zotero-pane-stack[oldsearchfield] textbox[type=search] {
-	margin: 0;
-	-moz-appearance: none;
-	padding: 3px 5px 2px;
-	border: 1px solid rgba(60,73,97,0.5);
-	border-radius: 10000px;
-	box-shadow: inset 0 1px 1px rgba(0,0,0,0.15), 0 1px rgba(255,255,255,0.25);
-	background-clip: padding-box;
-}
-
-#zotero-pane-stack[oldsearchfield] textbox[type=search][focused] {
-	box-shadow: 0 0 1px -moz-mac-focusring inset, 0 0 4px 1px -moz-mac-focusring, 0 0 1.5px 1px -moz-mac-focusring, inset 0 1px 1px rgba(0,0,0,0.15);
-	border-color: -moz-mac-focusring;
-}
-
-#zotero-pane-stack[oldsearchfield] textbox[type=search] > .textbox-input-box {
-	-moz-padding-start: 15px;
-	background: url("chrome://zotero/skin/mac/moz/Search.png") left no-repeat;
-	background-size: 14px;
-}
-
-@media (min-resolution: 1.5dppx) {
-	#zotero-pane-stack[oldsearchfield] textbox[type=search] > .textbox-input-box {
-		background: url("chrome://zotero/skin/mac/moz/Search@2x.png") left no-repeat;
-		background-size: 14px;
-	}
-}
-
-#zotero-pane-stack[oldsearchfield] textbox[type=search] > .textbox-input-box:-moz-locale-dir(rtl) {
-	background-position: right;
-}
-
-#zotero-pane-stack[oldsearchfield] textbox[type=search] > .textbox-input-box > html|*.textbox-input::-moz-placeholder {
-	opacity: 1.0;
-}
-/* End searchbox focus fix */
-
-
 #zotero-tb-search-menu-button
 {
 	margin: -6px -2px -6px -16px;
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index d83d1ea5f..464c931d6 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -107,12 +107,6 @@ var ZoteroPane = new function()
 			document.getElementById('zotero-pane-stack').setAttribute('platform', 'win');
 		}
 		
-		// Use pre-Yosemite search fields before Fx34
-		// See note in chrome/content/zotero-platform/mac/overlay.css
-		if (Zotero.isMac && Zotero.platformMajorVersion < 34 && Zotero.oscpu.contains(' 10.10')) {
-			document.getElementById('zotero-pane-stack').setAttribute('oldsearchfield', 'true')
-		}
-		
 		// Set the sync tooltip label
 		Components.utils.import("resource://zotero/config.js");
 		document.getElementById('zotero-tb-sync-label').value = Zotero.getString(