This is a very common issue and I think most of the Firefox users have experienced this problem. In this issue Your Mozilla Firefox browser uses much more memory than it really use. It will make your system very slow and sometimes it can be the reason of Mozilla Firefox Crash. Here we have some tips that can help your Mozilla Firefox to use less memory:-
Note:- Before following the steps below, I do not recommend you doing this unless you are comfortable editing the Computer Settings. I will not responsible for any damage that may be caused to your PC after editing the settings by following the steps below. You proceed at your own risk or may take help for Mozilla Firefox at +1-855-207-5444 (Toll Free)
You must review and monitor memory usage through particular tools. On Windows, You can do this by Performance tab of the “Windows Task Manager displays memory usage”.
You can update or download the latest version of Firefox.
You must update the latest plugins because it displays special types of content and it can consume large amounts of memory, especially older versions.
Your computer's registry may be full of old information which is slowing your computer down. When you remove programs from your computer, these old programs leave behind little pieces of code and data. This information builds up over time and slows down your computer a lot. So remove these old registry files by using some registry cleaner tool.