TRY THIS AT YOUR OWN RISK!!!
So hey guys!
Im gonna show you how to make your firefox use less memory.
make a new tab, and enter this into your url box:
about:config
Next, FF might show a error saying that this might void your warranty if you change any settings,
Just click ok.
Now left click in the window, and select new -> integer.
Set this as the name:
browser.cache.memory.capacity
and when it asks for the integer, set it to 60000.
Now restart FF and it will install some updates and you are good to go!
Dropped memory usage for me from 300k to about 75k.
Try it out!