Merge pull request #4687 from timvandermeij/attachments-content-type

Providing content type for attachment downloads

extensions/firefox/content/PdfStreamConverter.jsm

@@ -274,7 +274,8 @@ ChromeActions.prototype = {
       var listener = {
         extListener: null,
         onStartRequest: function(aRequest, aContext) {
-          this.extListener = extHelperAppSvc.doContent((data.isAttachment ? '' :
+          this.extListener = extHelperAppSvc.doContent(
+            (data.isAttachment ? 'application/octet-stream' :
                                  'application/pdf'),
             aRequest, frontWindow, false);
           this.extListener.onStartRequest(aRequest, aContext);