How to reduce the memory usage on Firefox?

Or, simply put
How to make Firefox run faster?

My old workstation has 1GB of physical RAM, 4 operating systems, and did I mention that it is OLD? There's no wonder that my browser acts slow and eats up my memory. Memory leak is a known Firefox problem, but it is getting better with each new version. So, first of all, it is a cleaver idea to upgrade to the latest version.

Extensions eats up memories like crazy, so uninstall all the add-ons or themes that you do not use.

Disable "Remember search and form history" from Tools > Options > Privacy tab.

Now let's get to the business:

1. Open Firefox and type about:config in the address bar.
2. Search for browser.cache.memory.enable, and set value true by double clicking.
3. Create a new integer value browser.cache.memory.capacity by right-clicking on the browser, selecting New > Integer from the pop-up; then set the memory value cache depending on your RAM size (check this link to get yours).
4. Create a new integer value config.trim_on_minimize by right-clicking on the browser, selecting New > Integer from the pop-up; then set value true.

Restart the browser, and you are done!
Hopefully, you will find your browser comparatively faster.

Fore more detailed tutorials visit Zolved Community Solution, The Hidden Guide, or MozillaZine.