diff --git a/chrome/content/zotero/lookup.js b/chrome/content/zotero/lookup.js
index 885211d7c..72bd7ce14 100644
--- a/chrome/content/zotero/lookup.js
+++ b/chrome/content/zotero/lookup.js
@@ -117,7 +117,10 @@ var Zotero_Lookup = new function () {
 	/**
 	 * Focuses the field
 	 */
-	this.onShowing = function() {
+	this.onShowing = function (event) {
+		// Ignore context menu
+		if (event.originalTarget.id != 'zotero-lookup-panel') return;
+		
 		document.getElementById("zotero-lookup-panel").style.padding = "10px";
 		
 		// Workaround for field being truncated in middle
@@ -132,7 +135,10 @@ var Zotero_Lookup = new function () {
 	/**
 	 * Cancels the popup and resets fields
 	 */
-	this.onHidden = function() {
+	this.onHidden = function (event) {
+		// Ignore context menu to prevent blanking on paste
+		if (event.originalTarget.id != 'zotero-lookup-panel') return;
+		
 		var txtBox = Zotero_Lookup.toggleMultiline(false);
 		var mlTextbox = document.getElementById("zotero-lookup-multiline-textbox");
 		txtBox.value = "";
diff --git a/chrome/content/zotero/zoteroPane.xul b/chrome/content/zotero/zoteroPane.xul
index 429260f38..4afcecbbf 100644
--- a/chrome/content/zotero/zoteroPane.xul
+++ b/chrome/content/zotero/zoteroPane.xul
@@ -161,7 +161,7 @@
 						</menupopup>
 					</toolbarbutton>
 					<toolbarbutton id="zotero-tb-lookup" class="zotero-tb-button" tooltiptext="&zotero.toolbar.lookup.label;" type="panel">
-						<panel id="zotero-lookup-panel" type="arrow" onpopupshown="Zotero_Lookup.onShowing()"
+						<panel id="zotero-lookup-panel" type="arrow" onpopupshown="Zotero_Lookup.onShowing(event)"
 								onpopuphidden="Zotero_Lookup.onHidden(event)">
 							<vbox>
 								<description>&zotero.lookup.description;</description>