16 Ways To Stop Firefox From Using Too Much Memory in 2022

Some browsers are more efficient than Firefox

by Loredana Harsana
Loredana Harsana
Loredana Harsana
Managing Editor
Loredana is a passionate writer with a keen interest in PC software and technology. She started off writing about mobile phones back when Samsung Galaxy S II was... read more
Fact checked by Alex Serban
Alex Serban
Alex Serban
Browser & Networking Expert
After moving away from the corporate work-style, Alex has found rewards in a lifestyle of constant analysis, team coordination and pestering his colleagues. Holding an MCSA Windows Server... read more
Affiliate Disclosure
  • If Firefox is using too much memory, it might be clogged by extensions or unnecessary settings.
  • Another reason for Firefox consuming too much memory is intrusive content or certain scrips.
  • So to cut on Firefox RAM usage, you will need to check and tweak several browser settings.
  • In the end, if all these don't solve the Firefox high memory usage problem, try a lighter browser.
Fix firefox using too much memory
Instead of fixing issues with Firefox, upgrade to a better browser: Opera
You deserve a better browser ! 350 million people use Opera daily, a fully-fledged navigation experience that comes with various built-in packages, enhanced resource consumption and great design.Here's what Opera can do:

  • Easy migration: use the Opera assistant to transfer exiting Firefox data, in just a few steps
  • Optimize resource usage: your RAM memory is used more efficiently than Firefox does
  • Enhanced privacy: free and unlimited VPN integrated
  • No ads: built-in Ad Blocker speeds up loading of pages and protects against data-mining
  • Download Opera

Firefox is one of the most popular web browsers on the market. However, Firefox has its issues and many users report that it uses too much memory on their Windows PC.

This not just affects the performance of Firefox but also the other programs and processes running on the computer. Which makes it all the more important to identify the underlying cause and eliminate it.

So, here is all you need to know about why Firefox is using too much memory and the best solutions for it.

Why is my Firefox taking up so much memory?

Sometimes, it’s a matter of an outdated browser. If you haven’t updated the browser in a while, do so today to prevent Firefox from using a lot of memory.

Also, the issue is commonly triggered by corrupted data or too much cache. Besides, extensions and certain browser values also affect how Firefox behaves on your system.

In addition to these, changing the theme could also lead to Firefox using too much memory, amongst a bunch of other reasons that we will take up in the next section.

How do I stop Firefox from using so much memory?

1. Switch to a different browser

Probably the quickest and most hassle-free way to get right back online without any errors is to use a different browser.

If Firefox keeps using tons of resources, we suggest you try a lightweight alternative like Opera GX. This browser aims to load pages fast even on lower-end PCs.

That is why it implements dedicated features like a RAM and CPU limiter. YOu can easily enable them and the browser will not bypass the limits, hence offering peak performance.

Using other apps while browsing the web can become demanding, but if you enable the bandwidth limiter feature and set how much data you want to allocate to your browser, your other apps will run faster too.

Opera GX

Open as many tabs as you want and load pages fast with this performance-oriented browser with minimal memory impact.

2. Update Firefox to the latest version

  1. Click the hamburger icon on the top right corner and then select Help from the menu.Firefox
  2. Next, click on About Firefox.About Firefox to fix firefox using too much memory
  3. A new window will now appear. Check if Firefox is up to date. In your version is outdated, Firefox will download the latest version automatically.Update

After updating Firefox to the latest version, check if the Firefox 100% disk problem is resolved.

3. Start Firefox in Troubleshoot Mode

  1. Click the hamburger icon to open the Firefox menu, and select Help.Help
  2. Now, click on Troubleshoot Mode here.Troubleshoot mode to fix firefox using too much memory
  3. Finally, click on Restart in the confirmation prompt that pops up.Restart

Firefox will now launch with extensions and other custom settings disabled, and if it now works fine, you know what’s using too much memory.

So, disable extensions one by one, or revert any changes made to the browser setting and see how it behaves. Hopefully, you’ll find the problematic plugin in no time.

4. Switch to the default theme

  1. Launch Firefox, and press Ctrl + Shift + A to open the Add-ons and themes.
  2. Select Themes from the tabs on the left.Themes to fix firefox using too much memory
  3. Now, click on the Enable button for the System theme-auto.Enable

After selecting the Default theme, restart Firefox, and check if everything is working properly.

Many users like to customize Firefox with new themes. Although some themes look visually impressive, they can lead to Firefox using too much memory.

To fix this problem, it’s advised you switch back to the default theme and check if your memory usage changes.

5. Disable all extensions

  1. Click the hamburger icon in the top-right corner and then choose Add-ons and themes from the menu.Add-ons & themes
  2. Navigate to the Extensions tab. A list of all installed extensions will appear.Extensions
  3. Turn off the toggle for the extension to disable it.Disable to fix firefox using too much memory
  4. Similarly, disable all the other extensions as well, and then restart Firefox.
  5. Now, check if the problem still persists.
    • If the issue is resolved, you need to go back to the Extensions tab and enable extensions one by one.
    • Be sure to restart Firefox after enabling each extension.
  6. After finding the problematic extension, click on the ellipsis next to it and select Remove.Remove to fix firefox using too much memory
  7. Again, click Remove in the prompt that appears.Remove

Users had issues with Ghostery, Skype Click to Call, and Greasemonkey, extensions. If you’re using these extensions, we advise you to disable them and check if that solves the issue.

6. Disable specific plugins

  1. Launch Firefox, press Ctrl + Shift + A, and navigate to the Plugins tab.Plugins
  2. Now, click on the ellipsis next to one and select Never Activate.Never activate to fix firefox using too much memory
  3. After Firefox restarts, check if the issue still persists. If the problem isn’t resolved, try disabling a different plug-in. (After finding the plug-in causing memory issues, be sure to enable all other plug-ins except that one.)

In addition to extensions, certain plugins can cause memory issues with Firefox. To fix the problem, you might want to try disabling these.

7. Hide intrusive content

hide intrusive content

Certain web content can be quite demanding on your resources and in order to prevent high memory usage you might have to hide it.

According to users, certain scripts can be quite hungry in terms of resources so you’ll have to disable them. To do that, you’ll need to use third-party extensions.

Expert Tip: Some PC issues are hard to tackle, especially when it comes to corrupted repositories or missing Windows files. If you are having troubles fixing an error, your system may be partially broken. We recommend installing Restoro, a tool that will scan your machine and identify what the fault is.
Click here to download and start repairing.

The NoScript extension will allow you to choose the scripts to disable on specific websites.

Keep in mind that disabling certain scripts can affect how some websites work, so choose carefully which scripts you disable.

8. Restart Firefox

You can temporarily fix this problem by restarting Firefox. Some users reported that Firefox memory usage can increase if the application is running for prolonged periods of time, so be sure to try this solution.

While this is a temporary workaround, it should work for most users.

9. Close unnecessary tabs

Each open tab increases the amount of memory Firefox uses. If you tend to have more than ten tabs open at all times, you might experience certain memory issues.

In order to improve performance and fix this problem, we strongly advise you close unnecessary tabs and keep only the ones you need open.

10. Terminate other processes

  1. Press Ctrl + Shift + Esc to launch the Task Manager.
  2. Now, locate the high-resource consuming processes, right-click on them individually, and select End task from the context menu.End task

Open tabs in Firefox will increase your memory usage, but other applications can also contribute to this problem.

Some applications can be quite demanding on your resources and that can leave less memory available to Firefox.

If you’re having any memory issues with Firefox, we recommend that you close any demanding applications running in the background. By doing that, you’ll free your memory and improve Firefox performance.

11. Use about:memory feature

  1. Launch Firefox, paste the following path in the address bar, and hit Enter:about:memorypaste
  2. On this page, you can view detailed reports regarding memory usage.view
  3. You can also free your memory with ease by clicking the Minimize memory usage button in the Free memory section.Minimize memory usage to fix firefox using too much memory

12. Change Firefox settings

  1. In the Firefox address bar, paste the following path and hit Enter:about:config
  2. If you get a warning message, click on Accept the Risk and Continue.Accept the Risk and Continue
  3. A list of options will appear. Find these specific options and change their values like so:
    • browser.cache.memory.capacity to 0
    • browser.cache.memory.enable to false
    • browser.sessionhistory.max_total_viewers to 0
    • browser.tabs.animate to disable
    • browser.sessionstore.max_concurrent_tabs to 0change values
  4. After making the changes, restart Firefox and then check if the problem is resolved.

In addition, you can also try changing these options:

  • javascript.options.jit.chrome to true
  • javascript.options.jit.content to true
  • content.notify.backoffcount to 5
  • network.dns.disableIPv6 to true
  • network.http.pipelining to true
  • network.http.proxy.pipelining to true
  • network.http.pipelining.maxrequests to 8
  • plugin.expose_full_path to true
  • ui.submenuDelay to 0
  • network.http.proxy pipelining to true
  • security.dialog_enable_delay to 0
  • browser.download.manager.scanWhenDone to false

13. Reduce memory usage when Firefox is minimized

  1. In the Firefox address bar, paste the following and hit Enter:about:config
  2. Enter config.trim_on_minimize in the text field at the top, select the option for Boolean, and click on the Add icon.Create boolean to fix firefox using too much memory
  3. Now, click on the toggle to set its value to True.True
  4. Restart Firefox and check if the problem is resolved.

If this solution doesn’t fix the problem, you can remove the newly created option or simply disable it by changing the value to False.

14. Change browser.sessionhistory.max_entries value

  1. In the Firefox address bar, paste the following path and hit Enter:about:config
  2. When the page opens, enter browser.sessionhistory.max_entries in the search bar at the top and click on the Edit button.open
  3. Now, change its value to 5 and save the changes.Enter 5 to fix firefox using too much memory
  4. Restart Firefox and check if the problem is resolved.

15. Change browser.cache.disk.capacity value

  1. Paste the following path in the address bar and hit Enter:about:config
  2. Enter browser.cache.disk.capacity in the search bar at the top, and click on the Edit icon.Edit
  3. Change the value to 50000 or any other value lower than the default one.change value to 50000 to fix firefox using too much memory

After making the changes restart Firefox and check if the problem is resolved. Keep in mind that changing this value can reduce your performance and make Firefox slower.

If Firefox becomes too slow, be sure to use a higher value or revert it to default.

According to users, you can fix this problem by changing the browser.cache.disk.capacity option. By changing this option, you can limit the amount of memory that Firefox uses.

By doing so, you’ll reduce performance but you’ll also cap the amount of memory Firefox uses.

16. Use Firemin

If you’re having issues with memory usage on Firefox, you might be able to solve that issue by using Firemin.

This tool allows Firefox to release unused memory periodically and drastically reduce memory usage as a result.

The tool is free and simple to use and if Firefox uses too much memory, be sure to download Firemin. There’s also a portable version available so you don’t have to install the application in order to run it.


How do I limit Firefox processes?

  1. Launch Firefox, paste the following path, and hit Enter:about:config
  2. Now, paste dom.ipc.processCount in the search field, and click on the Edit option.change value
  3. Enter the desired value here ranging from 1-8, and then save the changes.change value

That’s how you can easily limit the processes in Firefox!

Firefox using too much memory is a major concern, and you should now be able to fix it by using one of our solutions listed above.

If any of them worked for you, be sure to tell us in the comments section below. Also, if you have any more questions, don’t hesitate to drop them there, too.

idee restoro Still having issues? Fix them with this tool:
  1. Download this PC Repair Tool rated Great on TrustPilot.com (download starts on this page).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues with Patented Technologies (Exclusive Discount for our readers).

Restoro has been downloaded by 0 readers this month.

This article covers:Topics: