diff --git a/chrome/content/zotero/standalone/standalone.js b/chrome/content/zotero/standalone/standalone.js
index dbbc89f27d..c668d20e59 100644
--- a/chrome/content/zotero/standalone/standalone.js
+++ b/chrome/content/zotero/standalone/standalone.js
@@ -131,13 +131,14 @@ const ZoteroStandalone = new function() {
 			return;
 		});
 		
-		// Switch to library tab if dragging over one or more PDF files
+		// Switch to library tab if dragging over PDF/EPUB/HTML file(s)
 		window.addEventListener('dragover', function (event) {
 			// TODO: Consider allowing more (or all) file types, although shouldn't interfere with image dragging to note editor
 			if (Zotero_Tabs.selectedID != 'zotero-pane'
 					&& event.dataTransfer.items
 					&& event.dataTransfer.items.length
-					&& !Array.from(event.dataTransfer.items).find(x => x.type != 'application/pdf')) {
+					&& !Array.from(event.dataTransfer.items).find(x =>
+						!['application/pdf', 'application/epub+zip', 'text/html'].includes(x.type))) {
 				Zotero_Tabs.select('zotero-pane');
 			}
 		}, true);