That one gave me a problem on another site - I suddenly couldn't log in at all. It turned out to be a weird interaction between the new version of Firefox, the speed-dial add on I was using (FVD Speed Dial, which I'm no longer using - that wasn't the first time it caused problems), and that one site.
I don't think anyone really trusts Internet Explorer these days, including Microsoft, who are apparently looking at phasing it out in favour of something that isn't full of outmoded code and security holes - the new one is called Spartan and will incorporate their Cortana AI as seen in recent smart phones, and I suspect that I will hate it...
http://microsoft-news.com/confirmed-microsoft-is-phasing-out-the-internet-explorer-brand/
