Firefox constantly crashing

Some very specific sites are causing Firefox to crash on loading. It is 
annoying me a lot.  It is even happening in safe mode, and with my 
firewall disabled.

For example:

http://www.skytv.co.nz
http://www.virtualsuper12.co.nz/home_personal.asp

These are all on load.

Have uninstalled and reinstalled, deleted the program files folder etc

http://www.virtualsuper12.co.nz/home_personal.asp


Here's the technical info:

AppName: firefox.exe	 AppVer: 1.0.4.0	 ModName: js3250.dll
ModVer: 4.0.0.0	 Offset: 00028bcc

Have attached the txt file that it spat out too.

Any help appreciated, including some other places that may be able to 
help me.

Cheers
Allstarnz