I, too, switched to Chrome around when they launched due to drastically better performance. But shortly after (a couple years?), I found out Opera had similar performance and had cool other features, so I switched to that. Opera then converted to a Chrome-clone, so I switched to Firefox, which had largely caught up w/ performance by that time.

If you have the option, request that Firefox be added to the supported app list or whatever by your IT team. Tell them you need some Firefox-specific extensions or something for your job.