My Firefox has been pretty consistent through all the updates, though there was one that disabled the page back, page forward, and page close icons in the top left of the browser that annoyed me for a day or so before I found out how to fix it. Today it has been running really slow though. I had three open windows and one of them was streaming the Open on ESPN3 though so I don't know if it was FIrefox or ESPN3 that was causing the problem. I have Chrome as an alternative and I like it speedwise but I hate not having a progress bar and a lot of the other various knick-knacks that Firefox has.