Basically everytime I go on www.isketch.net the loading bar goes for a while then when it gets to the end firefox crashes with this message:

http://img233.imageshack.us/img233/6739/ffcrashc.png

I have the latest Shockwave and Flash player.

Is there a known solution to this?

If it's firefox 3.5, try clearing your cache by going into Tools > Clear Recent history > and select on the drop down "details" menu that the Cache box is checked. Then clear it. That usually fixes it. If it's an earlier version i think it's not recent history, it's called Clear Private Data.

If that doesn't help, it might be the browser itself. There are known conflicts between firefox 2 and shockwave 11.5.

Make sure you have a newer version of firefox (3.0 or later). If you already have firefox 3.x, try uninstalling firefox and shockwave and reinstalling freshly downloaded copies of each.

I have Firefox 3.5 and clearing recent history didn't seem to do anything.

You could also try temporarily disabling any obscure Add-ons you use, then trying to get on the site. One of them might be the trouble.

Or, if it's just the exact URL "www.isketch.net" that doesn't work; you could try one of http://isketch.net/isketch.shtml or http://isketch.net/i2.html

NoHints is right. For some reason isketch would never work properly for me when a debugging add-on i used to have was enabled.