firefox-1.0.1-1.3.1 When multiple Firefox windows are open, each with multiple tabs, switching between them doesn't appear to switch keyboard focus. The previous window reacts to Ctrl-PgUp/-PgDn et al instead of the current one.
I suspect you are going to have to give exact steps on how to reproduce this e.g.: 1. Go to location bar. 2. Type this particular url. etc. I couldn't reproduce this in firefox-1.0.1-1.3.1
This seems to have disappeared, so I'll go ahead and close it.