Memory leaks occur the longer the browser is kept running and everything from the page that has been open for extensions you have installed the effect of how much memory is leaked. Plumber Firefox claims to provide simple and trouble-free solution. Download the file, unzip and run the file Foxboost.exe. A small icon will appear in the system tray and that's all you'll see a small appliance. During that run, he will continue to plug leaks. Developed by Rizone3, working on many of the same principles as their memory optimization engine with a few minor tweaks made to manage memory leaks in Firefox. This tool has no complicated settings or interface and runs quietly in the background. Based on the tests, with up to 20 tabs open, physical memory usage went from 185MB to 4MB. The rest get locked in a virtual memory to prevent leakage.
Firefox Plumber: Stop Firefox Memory Leak