In the process of identifying https://bugzilla.mozilla.org/show_bug.cgi?id=901590, we found this may need IID revved. Based on my lookup in hg looks like this file was last touched due to : % hg log ./uriloader/exthandler/nsIExternalHelperAppService.idl changeset: 145428:b6cce1e41253 parent: 145425:ca43cd65708b user: Monica Chew <mmc@mozilla.com> date: Mon May 27 18:33:39 2013 -0700 summary: Move execution from nsExternalAppHandler to nsDownload (b=858234, r=paolo) changeset: 145114:1623ffc069a0 user: Ryan VanderMeulen <ryanvm@gmail.com> date: Fri May 31 16:06:10 2013 -0400 summary: Backed out changeset 019382e24635 (bug 858234) for Linux mochitest-5 leaks. changeset: 145097:019382e24635 user: Monica Chew <mmc@mozilla.com> date: Mon May 27 18:33:39 2013 -0700 summary: Move execution from nsExternalAppHandler to nsDownload (b=858234, r=paolo) Hence ccing folks related who can help. Please note this needs to be resolved before firefox 24 Beta1 goes to build today.In case this is a false alarm feel free to resolve invalid.The existing script we use may include cases for comments or other false positives.

Hello bajaj, That changeset removed closeProgressWindow from the nsIHelperAppLauncher interface. The download manager has a new UI, and there is no longer a progress window. There are no native callers to closeProgressWindow, I can't think of a legitimate reason for an addon to call it, so I don't think it's worth revving the version number. Many addons that touch downloads will have to be modified anyway, and that discussion is going on on firefox-dev. Thanks, Monica