diff --git a/src/js/traffic.js b/src/js/traffic.js
index f49222d3d..f854e6b38 100644
--- a/src/js/traffic.js
+++ b/src/js/traffic.js
@@ -353,7 +353,7 @@ var onRootFrameHeadersReceived = function(details) {
 
     // Check if the main_frame is a download
     // ...
-    if ( headerValue(details.responseHeaders, 'content-disposition').lastIndexOf('attachment', 0) === 0 ) {
+    if ( headerValue(details.responseHeaders, 'content-type').lastIndexOf('application/x-', 0) === 0 ) {
         µb.tabContextManager.unpush(tabId, details.url);
     }