To quote some relevant comments on other threads here: > If you could grab a profile of the problem with the Firefox profiler and file a bug it would be greatl

To quote some relevant comments on other threads here: > If you could grab a profile of the problem with the Firefox profiler and file a bug it would be greatly appreciated. From the sounds of it it's probably an edge-case we're not aware of where Firefox performs very poorly. The problem with this kind of things in Mozilla is that we're often blind until someone brings up the issue and notifies us. https://news.ycombinator.com/item?id=33156379 https://news.ycombinator.com/item?id=33156379 > Here are instructions of using the profiler with just a few clicks: https://profiler.firefox.com/ https://profiler.firefox.com/ https://news.ycombinator.com/item?id=33156317 https://news.ycombinator.com/item?id=33156317