http://www.factorioforums.com/forum/viewtopic.php?f=3&t=14613 Loading this site causes Firefox Nightly to perform terribly in both the current tab and in sibling tabs. I don't know what they are doing, but the page will load, slow to a crawl, then impact other tabs to the point were they don't load content anymore leaving a blank screen. There's no crash associated, but it's so bad I can't load anything on that forum for fear of this performance issue. The site performs fine-ish using Firefox standard release. There is a bit of delay to redraw when scrolling down (or up) the page, but the Nightly build absolutely takes a dump on performance and makes the entire browser unusable.