(Solved) Fixing Firefox Uses Too Much Memory Issue

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Firefox sometimes uses more memory (RAM) than it should. This can make Firefox slower, and in extreme cases, it can even cause a Firefox crash. This article describes how to make Firefox use less disk space.

Firefox plays better than most browsers with third-party add-ons, but as developers have already mentioned, some of them can slow down your computer considerably. They are therefore working on a “Optimize Firefox” button that will stop all extensions when the browser is restarted (below). This alone could improve things, and “you can always restart it later,” say the developers.

Update Mozilla Firefox

The first thing we recommend is to check for Mozilla Firefox updates and update them if there are any. Is it possible that older versions have bugs or performance problems? Newer versions generally offer improved performance and fix bugs. To check for updates to Firefox, open it and click on the three bands at the top right (Open menu), then on the “Help” option.

Mozilla Firefox starts checking for updates. If updates are found, Mozilla will install them for you. If you already have the latest version, you will see the status “Firefox is up to date”.

Disabling memory intensive extensions and themes

Extensions and designs can cause Firefox to consume more memory than would normally be the case.

To determine if an extension or theme causes Firefox to consume too much memory, start Firefox in safe mode and monitor its memory usage. In safe mode, extensions and themes are disabled. So if you notice a significant improvement, you can try to disable or uninstall the extensions.

Restart the Firefox browser

Whenever you notice that Firefox is using too much memory, it is best to restart your web browser. This often helps you.

Before doing the same, configure Firefox to save open tabs. It allows you to restart them where you left off.

Then open Firefox again and restore the previous session using the options of the “Menu” button.

Reduce memory usage by using Firefox settings.

You can customize some Firefox settings to work faster and use less disk space.

About:config Settings

First of all, you must install the latest version, because in the latest version, you have considerably improved memory consumption. They allow the browser to use as little memory as possible. If your version is old, update it. Or you can download the latest version here.

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If you are using the browser, try to open the minimum tabs. Because if you have too many tabs open, they will take up more disk space and slow down the overall speed of your browser.
Type “about:config” in your browser and set the following options in the list that appears.

  • Ability.of.the.browser’s.cache.memory.->.setting.to.0
  • Browser.tabs.animate -> disable
  • Javascript.options.jit.chrome -> set to true
  • Javascript.options.jit.content -> set to true
  • Network.http.pipelining -> set to true
  • Network.http.proxy Pipelining -> set to true
  • Plugin.expose_full_path_full -> set to true

Reduce session history

browser.sessionhistory.max_entries determines the maximum number of pages in the browser’s session history, i.e. the maximum number of URLs that can only be browsed using the Back/Advance button. The default value is 50, we will generally not browse more than 5 of the sites we have visited before, and there is really no need to store more than that in the session that can block memory as they grow.

1. open Firefox
2. enter about:config in the Firefox address bar.
3. press CTRL-F and search for browser.sessionhistory.max_entries.
4. Double-click on the value 50 (or the current value) and change it to something lower, for example 5.
5. restart Firefox.

Enabling hardware acceleration


Flash content requires RAM to be loaded. However, hardware acceleration in the Firefox browser can reduce your memory load if a dedicated graphics card is installed on your system. Therefore, in this step, we will ensure that the Hardware Acceleration function is enabled.


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