Two Firefox memory tweaks

[13Gigatons]

Memory Usage Upon Minimize
There is a pref that enables trimming Firefox memory usage when you minimize all Firefox windows. This pref is for Windows only. To enable it, set config.trim_on_minimize to true using about:config.

Might need to add this if it doesn't exist. Right Click inside about:config window and create a NEW Boolean set to true. Minimize firefox and watch the memory drop to 3 or 4 megs.

I find this tweak very useful for those who want to keep Firefox open for long periods and use other memory hogging apps.

Firefox Memory Cache
By default, Firefox does not use a fixed size memory cache - it uses a percentage of system memory. Setting a fixed size memory cache can often reduce memory usage - 4 or 8MB is sufficient in most instances. To set a fixed size memory cache, add the following pref using about:config:
browser.cache.memory.capacity
This is an integer pref, and can be set to the size you want the cache to be (in kilobytes)

I set mine to 8000 and it seems to run fine.

 

[erikistired]

mine drops from 29mb to 17mb with 2 tabs open when i minimize (after the tweak).

 

[imported_LoKe]

The cache tweak is really obvious. Firefox store a lot of garbage in your cache that you really don't need. It really depends on the kind of browsing you do. My chache limit was set at 65xxx, I decided to lower it to 10xxx and there's a noticable difference.