I believe that I read somewhere that there is a new Beta version of firefox. Some people have found a few bugs but it is supposed to be pretty stable (someone mentioned there was an issue w/ ebay, another user said they didn't have any problem.)
May be worth trying, and if it isn't worth trying, atleast that means a new version should be out soon that perhaps covers this problem.
http://www.mozilla.org/products/firefox/
its under the green box with "Free Download" written in it. "try firefox 1.5 Beta 2"
I haven't tried it myself. If someone gives it a wirl, let us know how it goes.