That is unfortunately a bug (Bug 662898) that slipped into Firefox 5 and that will be fixed in Firef

That is unfortunately a bug (Bug 662898) that slipped into Firefox 5 and that will be fixed in Firefox 6, due to be released in August.

http://forums.mozillazine.org/viewtopic.php?f=25&t=2240429

/questions/843162

/questions/841539