WordPress 2.6 hangs Firefox 3 occasionally

A few days ago, I upgraded from WordPress 2.3 to 2.6. Since then, generally everything works fine, but every now & then, opening an existing post seems to lock Firefox at 100% processor usage & after a few minutes I’ve had to kill Firefox.

Has anyone else noticed this problem? It seems to occur just after the page has started loading – there is some stuff visible on screen, but not everything.

It probably affects one out of every fifteen or so times I try & load a page.

Prior to the 2.6 upgrade I never experienced the problem – I am running various plugins, but these were all at the same version beforehand.