FIX: Mozilla Firefox Memory Leak in Windows 10

Ivan Jenic
by Ivan Jenic
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6 solutions to fix Firefox high memory usage in Windows 10

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

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.

What to do if Firefox uses too much memory

Solution 1: Update your browser

mozilla firefox windows 10

First, make sure that your Firefox is up-to-date, because newer versions of the browser usually take less memory. To download the latest Firefox version, go to Mozilla’s official website.

Solution 2: Disable your plugins

You can also disable or delete some unnecessary plugins and add-ons, because 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.

— RELATED: Fix: Keyboard not working in Firefox

Solution 3: Check Firefox preferences

But if your browser is updated, and you run only necessary plugins and add-ons, you’ll have to do a couple of tweaks in order to solve the memory leak problem. Here’s what you should do:

  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)

Solution 4: Enable Hardware Acceleration

There are particular plugins that can use your hardware to render videos. In this manner, the impact that the browser has on your computer memory can be reduced. Here’s how to enable Hardware Acceleration:

  1. Launch a page that plays Flash video > right-click on the video player > go to Settings to open the Adobe Flash Player.
  2. Open the Display panel.
  3. Make sure to check the ‘Enable hardware acceleration’ option.
  4. Close your browser and launch it again.

— RELATED: Full Fix: Firefox install stuck in Windows 10, 8.1, 7

Solution 5: 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.

Solution 6: Use the ‘Minimize memory usage’ button

Fortunately, there is another method you can try if the problem didn’t go away. Here’s what you can do.

  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”
  4. Restart your browser

As simple as it looks, this method works. 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 a 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.


Editor’s Note: This post was originally published on April 2015 and has been since updated for freshness, and accuracy.