Firefox Tweaks

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).

There has been some debate about how Firefox sets the memory cache size. See bug 105344, bug 204164 and bug 296538 for various discussion about this issue.

You can also disable the Firefox memory cache completely, however this is not recommended. To do this set the following pref to false using about:config:

browser.cache.memory.enable