If Mozilla Firefox crashes for you or is giving you slowdown issues like consuming excessive amounts of CPU, then you can try the Reset function of Firefox. It's a useful but rarely covered feature. Resetting quickly solves any issues caused by damaged or incorrectly configured settings, and saves your time. It can resolve issues related to unexpected Firefox behavior, e.g. recently I removed a malicious user script running in my friend's Firefox profile using Reset. Let's see how to use the Reset Firefox feature.