Although with every new version of Firefox, there are improvements in memory usage, the browser still has memory leaks. This is evident from the fact that if you keep Firefox open with few tabs for over 3 or 4 days, you can see the memory usage increasing. Firemin is a freeware tool for Windows which can optimize the memory usage on Firefox by minimizing memory leaks. The app runs from system tray and optimizes the memory usage based on your setting.


The application does not require any installation and is completely portable. You can use the slider to set the memory usage and based on this, the tool optimizes the memory usgae. We tried it on our Firefox installation and below are the results.

Before using Firemin, Firefox was using around 208MB of memory.

Before Optimizing

Now we started Firemin and set the limits and from the below image you can see Firefox memory usage was 3MB and that was a big time optimization.

After optimization

You can also optimize Firefox from the system tray option for this program.

Related Reading: Automatically restart Firefox if memory usage is High

Download Firemin