I use Google Chrome most of the time, unless I'm doing my searches. Then I use internet explorer for my fusion cash searches unless it's performing poorly and then I use firefox.
If you are just doing your regular work on fusion cash and not doing searches, you might want to try the Opera browser. It's free and I haven't had much problem with it when doing things on fusion cash.
Another tip, if your browsers are having problems with constant crashing or anything else your computer might be infected with a virus/spyware, have registry issues where a format or cleaning is required (get a pro's advice before attempting to do it yourself due to the sensitivity of the registry) or just have a lot of junk files. You can use ccleaner to clean junk from your computer as the regular version is free and you can also clean more junk by typing %temp% in the run box on windows and deleting all that is in that folder. Hold Ctrl & click A to select all the files. Once you are done with that type Prefetch in the run box and delete all the files. That should help as well, but please know all the files won't be truly removed until you restart your computer. Also make sure to defrag your computer whenever it needs it. Cleaning the temp, prefetch etc should be done at least once or twice a month.
You can get free assistance in spyware and virus removal by going to forums like spywarewarrior.com, whatthetech.com, geekstogo.com and pcpitstop.com. Help is given as the helpers are available since they have many cases to work on. If your computer is having too many problems or a really tough virus it may need a complete format and software installation. This may not be your problem, but if it is then I hope this helps you. My computer was slow, had browser issues and other problems which didn't improve until I got help and did a format. If your computer is under warranty you can usually call the manufacturer to help you troubleshoot your issue.