I updated to the next 3.xxx version then it said that Firefox 4 was available so I downloaded and installed that one. The new look and feel is nice. Yet, the new Firefox 4 runs more slowly than the old version on this computer. The change was immediate with the installation of Firefox 4. The cursor lags when moving across the screen. Video runs choppily and at lower quality resolution. Netflix sets itself to lower, grainier quality when playing streaming movies. Will this persist? Is there a way to fix this? Should I re-install the last 3.xxx version of Firefox on this computer.