You can read the details of this elsewhere but here is a quick and easy fix to memory sucking that Firefox is prone to do.
In the address bar type:
In the “Filter:” text box type:
You should see
From here you can either double click on “browser.cache.memory.enable” or right click and use the toggle option to change the Value to false.
Restart your browser and you should be a much more reasonable memory load. Note that sometime the Firefox processes don’t end when you close down the browser so manually killing the process or a reboot will solve the problem.
Happy Surfing Folks