FIX: Mozilla Firefox memory leak in Windows 10

Ivan Jenic
by Ivan Jenic
Troubleshooting Expert
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Firefox is one of the most popular browsers today, but even this stable, user-friendly browser could cause some problems.

After some time, Firefox could start to take more memory than it should, but we’ll tell you how to solve this problem.

Making sure your browser is up to date and even disabling the plugins seems to be helpful.

In this article, we compiled a list of solutions that will help you fix Firefox’s high memory usage in Windows 10.

What can I do if Firefox uses too much memory?

  1. Switch to another browser
  2. Update your browser
  3. Disable your plugins
  4. Check Firefox preferences
  5. Enable Hardware Acceleration
  6. Use fewer tabs
  7. Use the Minimize memory usage button

1. Switch to another browser

Millions of people worldwide chose Opera for its speed, privacy, and the new features that allow them to work and browse faster and more efficiently. With this browser, you do get more time and speed by being able to organize your tabs and workspace in a manner that is not even more time-consuming.

You can switch to Opera really fast, the download takes only a couple of seconds and you’ll have the browser installed on your device in no time.

Using Opera ‘s unique functionality, you can automatically import all your browser info, install Chrome extensions and begin browsing immediately.

The more tabs you have open in your browser the lesser memory is available. How about forgetting all about that with Opera’s Workspace functionality? You can organize your tabs based on interests or personal/professional search. It’s only up to you which categories you want to creat.

Workspaces will allow you to navigate smoothly through your browsing history, you’ll find faster what you are looking for and you’ll save more memory by closing all the other tabs that you don’t need.



If you want to work faster with a reliable browser that allows you to organize your browsing history in Workspaces, then this is your best choice!

2. Update your browser

  1. Click the Menu icon in the top right corner and choose Help.
    Keyboard not working in browser
  2. Choose About Firefox from the menu.
    Firefox can't type in text fields
  3. If any updates are available, they will be installed automatically.
    Not able to type in Firefox browser

3. Disable your plugins

You can also disable or delete some unnecessary plugins and add-onsbecause they also could use a lot of memory.

Actually, disabling unnecessary add-ons and plugins proved to be the best memory saver option. Of course, if it turns out that you need some of the disabled add-ons, you can always re-enable it.

4. Check Firefox preferences

  1. Type about:config in Mozilla Firefox bar and adjust the following preferences (by double-clicking on them) to enhance your memory:
    • browser.cache.memory.capacity (set to 0)
    • browser.cache.memory.enable (set to false)
    • browser.sessionhistory.max_total_viewers (set to 0)
    • browser.tabs.animate (disable)
    • browser.sessionstore.max_concurrent_tabs (set to 0)
  2. Now, edit the following preferences to boost the loading speed:
    • (set to true)
    • javascript.options.jit.content (set to true)
    • content.notify.backoffcount (set to 5)
    • network.dns.disableIPv6 (set to true)
    • network.http.pipelining (set to true)
    • network.http.proxy.pipelining (set to true)
    • network.http.pipelining.maxrequests (set to 8)
    • plugin.expose_full_path  (set to true)
    • ui.submenuDelay  (set to 0)

5. Enable Hardware acceleration

  1. Launch a page that plays Flash video and right-click on the video player.
  2. Go to Settings to open the Adobe Flash Player.
  3. Open the Display panel.
  4. Make sure to check the Enable hardware acceleration option.

6. Use fewer tabs

Most Firefox users open only a few browsers at the same time. However, if you have around 100 tabs open at once, this may affect your memory. Try to close the tabs that you’re not using actively.

7. Use the Minimize memory usage button

  1. Open Mozilla Firefox Browser.
  2. In the Address Bar type in about:memory.
  3. Under the Free Memory tab, click on Minimize memory usage.

As simple as it looks, these methods work. Don’t forget to always update your version of the browser you are using.

Mozilla Firefox Quantum is now available to try, a newer and faster version than ever before. If you want to download it, here’s a link.

You also should know that the more powerful computer you have, the more memory Firefox will use.

So you shouldn’t think that you’ll surely avoid memory leaking problems with Firefox if you have more memory in your computer.

That would be all, if you have any suggestions, comments or maybe other solutions of this problem, we would like to read your thoughts in the comments section below.

FAQ: Learn more about Mozilla Firefox

  • How do I fix memory leak in Firefox?

To fix memory leaks in Firefox, be sure to update your browser and disable all addons. In addition, try opening fewer tabs.

  • Why is Firefox using so much RAM?

If Firefox is using too much RAM, that can be due to the number of open tabs or due to certain extension that is working in the background.

  • Does Firefox drain the battery?

Yes, Firefox drains the battery, and it will drain more of your battery if you have multiple tabs open or if you’re running resource-intensive extensions. Explore our thorough battery optimization tips.

  • How do I optimize Firefox?

To optimize Firefox, make sure that you’re not having dozens of tabs open. Also, disable or remove any extensions that you don’t use actively.

Editor’s Note: This post was originally published in April 2015 and has been since revamped and updated in August 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in April 2015 and was revamped and updated in August 2020 for freshness, accuracy, and comprehensiveness.