diff --git a/chrome/content/zotero/xpcom/attachments.js b/chrome/content/zotero/xpcom/attachments.js
index d4f6e6066..554d7daa9 100644
--- a/chrome/content/zotero/xpcom/attachments.js
+++ b/chrome/content/zotero/xpcom/attachments.js
@@ -220,6 +220,9 @@ Zotero.Attachments = new function(){
 				var browser = Zotero.Browser.createHiddenBrowser();
 				var imported = false;
 				var onpageshow = function() {
+					// ignore spurious about:blank loads
+					if(browser.contentDocument.location.href == "about:blank") return;
+					
 					// pageshow can be triggered multiple times on some pages,
 					// so make sure we only import once
 					// (https://www.zotero.org/trac/ticket/795)
@@ -1164,6 +1167,9 @@ Zotero.Attachments = new function(){
 		var browser = Zotero.Browser.createHiddenBrowser();
 		
 		var callback = function(charset, args) {
+			// ignore spurious about:blank loads
+			if(browser.contentDocument.location.href == "about:blank") return;
+			
 			var charsetID = Zotero.CharacterSets.getID(charset);
 			if (charsetID) {
 				var disabled = Zotero.Notifier.disable();
diff --git a/chrome/content/zotero/xpcom/file.js b/chrome/content/zotero/xpcom/file.js
index ccd4c5a89..170a8aa43 100644
--- a/chrome/content/zotero/xpcom/file.js
+++ b/chrome/content/zotero/xpcom/file.js
@@ -240,6 +240,9 @@ Zotero.File = new function(){
 				.getURLSpecFromFile(file);
 		
 		this.addCharsetListener(browser, function (charset, args) {
+			// ignore spurious about:blank loads
+			if(browser.contentDocument.location.href == "about:blank") return;
+			
 			callback(charset, args);
 			Zotero.Browser.deleteHiddenBrowser(browser);
 		}, args);