This is not specific to Firefox, I can reproduce that bug on evolution, thunderbird, pidgin, virtualbox, gnucash, sunbird, GIMP, OpenOffice. The only one programs that I tried that doesn't have this bug was gedit. The firefox developers on the upstream bug seems to have the same opinion. This bug is still not fixed in Hardy and Gutsy, I believe that we should find to which package is really the source of this bug because it affects a lot of programs and users.
This is not specific to Firefox, I can reproduce that bug on evolution, thunderbird, pidgin, virtualbox, gnucash, sunbird, GIMP, OpenOffice. The only one programs that I tried that doesn't have this bug was gedit. The firefox developers on the upstream bug seems to have the same opinion. This bug is still not fixed in Hardy and Gutsy, I believe that we should find to which package is really the source of this bug because it affects a lot of programs and users.