Running Xubuntu on an Acer-XC-603 - Firefox intermittently hangs

I would like to know if anyone else uses the same type of Acer computer [Aspire-XC-603] and has the same problem with running Firefox. It periodically freezes. I was told it has something to do with the wrong graphic chip, but I am wondering if it could be related to my use of Firefox or installation of either Xubuntu or Firefox. I'm a "dumb user" so please don't be too technical!

Thanks,

Reynold