- Enter "about:config"(without quotes) in the address bar. Search for
- You can also instruct Firefox to release the memory space that is no longer in use. Simply right click on any space in the list of configuration settings and select the context command "New > Boolean". Enter "config.trim_on_minimize"(without quotes) and click "OK".
You can also determine the current memory requirement of the browser is through the "Task Manager".
- Press the key combination [Ctrl] + [Alt] + [Del] and click on "Task Manager" in the following dialog under Windows 2000/XP
- Switch to the "Processes" tab and search the list entry "firefox.exe". To its right, you will see the memory space currently occupied by the browser.