I would like to change the default web browser in Thunderbird to a different one from Firefox. I found an answer at http://opensource.about.com/od/Internet/a/How-To-Change-The-Default-Browser-In-Thunderbird.htm I went to Edit>Preferences>Attachments>Incoming There is no listing for http://... The web browser, Qupzilla, that I would like to be the default does not seem to have a way to set it as the default for my system. Thank you, Jim