Firemin is a small and reliable software solution that runs from the system tray and attempt to reduce/eliminate possible memory leaks in Firefox and decrease the amount of memory used by Firefox. Due to Firefox’s memory leakage, Firemin runs the clean memory API call a few times per second, rather than Windows Memory Management which performs similar operations less frequently.
One of the biggest “improvements” that Mozilla claims is the Firefox memory usage, in particular, the vanquishing of memory leaks. Although Firefox memory usage improved a little over the last few years, it still uses a lot of memory. That's why Firemin has created.