I've been trying to uninstall firefox 4.0.1 and then install a older more stable version of firefox on my bt5. Though when i try to install the older version of firefox back onto my bt5 it seems to...

hey guys
I'm stuck on this problem I'm trying to remove firefox 4.0.1 and then installing firefox 3.0 on install. But every time i run the command below it seems to be installing firefox 4.0.1 back...