If you've recently upgraded your copy of Mozilla and are experiencing weird segfaults/crashes, this should fix it for you:
$ su # rm /opt/mozilla/component.reg # /usr/bin/mozilla (as root for the first time only)
This allows the newly installed version of mozilla to re-register those magical components it uses and not crash on you. I believe this issue has been fixed in 1.0, so we won't have to do this for subsequent upgrades.
Happy surfing.