Description of Problem: If using the junkbuster proxy it's necessary to instruct mozilla to use http 1.0 because junkbuster does not work correctly with http 1.1. In mozilla 0.9.9, this was set in the "debug->networking" section, which seems to have been removed. Version-Release number of selected component (if applicable): mozilla-0.9.9-12.7.2 Easiest way to fix is to upgrade to a newer mozilla- in 1.0rc1 and later the pref has been moved to "Advanced-HTTP Networking", so it won't disappear with the debug prefs.
Fixed in rawhide.