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Firefox: the memory usage lower

  • Nov 12, 2025
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The memory to reduce usage of Firefox, especially on older System very helpful: The Mozilla Browser often takes up some 100 MB of memory and slows down thus, depending on the available RAM – the whole Computer.

Firefox: memory usage reduced by Add-on control

To Firefox is not a brisk Browser as long as he is a leg himself. By installed Add-review ons, you can help him back on his feet:
  • Not only should you always have the latest Version of "Firefox" to use, but also the Plugins, always keep it up to date.
  • To Update, open "tools | Add-Ons", click in the following Dialog on "extensions" and then click "Update".
  • So the Browser and Add-ons in the future-to-date automatically, open "tools | settings" and click on "Advanced". You change including to the tab "Update". In the area of "Automatically check for Updates check for" enable the options "Firefox" and "Installed Add-Ons" and confirm with "OK".
  • You can test in Safe mode of the browser, whether in fact the extensions for the excessive memory hunger are responsible. To do this, click with the right mouse button on the program Icon, select "properties" and then tap in the Dialog after the program invocation, the Parameter "-safe-mode".
  • Confirm and open the Browser. In the startup dialog, select "All Add-Ons disable" and click "In the Safe Mode continue to work". Check in Task Manager how much lower the memory usage is now. A few megabytes of difference is normal, since the extensions themselves occupy space and, for some functions, additional memory must make a reservation. Only in a considerably larger difference, you actually have a Problem with an extension.
  • Restart Firefox then again in normal mode. Then open "tools | Add-Ons | extensions", select an extension, click the corresponding "Disable" button and restart Firefox. Check whether the memory has improved. Then "Activate" the extension again and repeat the process with the next. In this way, you can identify the problematic Add-on and disable it. Suspect candidates for memory error or a high memory requirement are Adblock, Fasterfox, Forecastfox, Tabbrowser Extensions , as well as the Google Toolbar.

Firefox configuration, optimize storage, reduce utilization

The Cache speeds up the Browser. If he moves, but from lack of memory in the paging file, reverses the effect. Therefore, you should tune the Cache on the RAM memory.
  1. To do this, write in the address bar "about:config" and press Enter.
  2. In the "Filter" box type "browser.cache".
  3. In the list check that the setting "browser.cache.memory.enable" the value is "true" and set it by double clicking.
  4. Now click to edit double-click the setting "browser.cache.memory.capacity". If you have 4 GB of RAM, leave the value at 65536. With less RAM you can change the value proportionally, i.e., approximately at 16384 in the case of 1 Gigabyte of RAM. To do this, double-click the setting, enter the new value in the Dialog and confirm the Change with "OK".
  5. Free RAM: A further configuration setting causes Firefox when you Minimize a bulk of the memory to be free. To do this, click with the right mouse button on a free area of the dialog window, and open "New | Boolean". Then type "config.trim_on_minimize" and confirm with "OK". In the next Dialog, select "true" and "OK". After a restart of Firefox, the setting is effective.

Delete unwanted data to make Firefox faster

Firefox saves Downloads and in the chronicle of all the websites visited. These data, however, you need only a short period of time – delete them regularly, preferably automatically.
  • To do this, open "Extras | settings" and click on "privacy".
  • Under "history" - let you "Visited pages save for the last" enabled, set the value to "1" – so Firefox only keeps data for one day.
  • You can also disable the Option "downloaded files" remember, if you do not want to save. "OK" confirms the Changes.
  • Now you open "tools | Downloads". In the list, each Download can be separately through the Link "delete" to Remove it. With a click on "cleanup" to empty the list.
Further Tuning tips for the Mozilla Browser we have them here collected.

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