Mozilla Firefox is too slow? Here’s how to speed it up

Milan Stanojevic
by Milan Stanojevic
Windows & Software Expert
Milan has been enthusiastic about PCs ever since his childhood days, and this led him to take interest in all PC-related technologies. Before joining WindowsReport, he worked as a front-end web developer. Read more
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  • When Firefox is slow on your Windows 10 device, the browser theme or settings might be the main reason. 
  • Firefox browser is slow also when the antivirus is interfering in several processes. 
  • On the other hand, each time you're facing slowdown issues, make sure that you're using the right version of Firefox.
  • If otherwise, uninstall it and get the correct and updated browser version from the official website.
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Firefox is one of the most popular browsers on the Windows platform, but despite its massive popularity, it still has certain issues on Windows 10.

Many users are complaining that Firefox is lagging on their Windows 10 devices and this can be a major problem if you use it as a default browser.

So in this article, we’re guiding you through the few solutions available to fix this issue.

What can I do if Mozilla is running slow on my Windows 10?

1. Switch to another browser

try out Opera

When Mozilla Firefox is too slow, Opera is one of the best alternatives to think of. This browser is widely used and mainly in Windows when other options fail to meet expectations.

All you need to do is to enable the TURBO mode and this will make surfing the Internet even faster than usual. Even more, there’s no limit for speed dials to worry about.

Alike Firefox, expect getting extensions and add-ons, instant tab preview, and crypto mining protection.

However, Opera is the one that truly has an impressive track record when it comes to security, with a free VPN and a Crypto Wallet to take advantage of regularly.



If Firefox fails to meet your expectations, consider using a great alternative. The Opera browser won’t disappoint you!

2. Check your antivirus

use BullGuard

If Firefox is slow on your Windows 10 PC, the problem might be your antivirus. Such software is a necessity, but sometimes it can interfere with your web browser and cause slowdowns.

Many antivirus tools also tend to install various extensions in order to offer extra protection, but they often slow down your browser.

If Firefox is running slow, be sure to remove any extensions that are installed by your antivirus. These extensions aren’t mandatory, so you can disable or remove them without fear.

In addition to extensions, you might want to check your antivirus settings and see if modifying them fixes the problem.

Several users reported that disabling the Active Protection feature fixed the problem for them, so you might want to try that.

As a last solution, you might have to uninstall your antivirus in order to fix the problem. Many users reported issues with Norton antivirus, but after removing it, the problem was completely resolved.

If you decide to remove your antivirus, you should definitely consider switching to a new antivirus solution. There are many great antivirus tools on the market, yet the best one clearly remains BullGuard.

Besides the fact that it provides great security and anti-malware protection, rest assured that it won’t interfere with your browser in any way.



A top antivirus that never interferes with your browser is the powerful BullGuard. Try it out right away!

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3. Change your power settings to High Performance

  1. Press Windows Key + S and enter power settings. Choose Power and sleep settings from the menu.
    Firefox slow playing videos
  2. Now select Additional power settings.
    Firefox slow crashing
  3. Once the Power Options window opens select High-Performance profile.

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Run a PC Scan with Restoro Repair Tool to find errors causing security problems and slowdowns. After the scan is complete, the repair process will replace damaged files with fresh Windows files and components.

We have to mention that switching to High-Performance mode will drain your battery faster due to increased power consumption, but Firefox should be working without any slowdowns.

4. Switch to a different theme

  1. Open Firefox and click the Menu button in the top right corner and choose Add-ons.
    Firefox Quantum slow Windows 10
  2. Select Get Add-ons tab on the right and click Featured themes.
  3. Try to find a simple theme that won’t use too much of your resources and install it.

This is just a potential workaround, but few users reported that it works for them, so you might want to try it.

5. Change your settings

  1. Click the Menu button in the top right corner and choose Options from the menu.
    Firefox slow to load pages Windows 10
  2. Select Privacy & Security from the menu on the left. Now scroll down to the Permissions section and make sure that Prevent accessibility services from accessing your browser option are enabled.
    Firefox slow not responding

After enabling this option, check if the problem with Firefox is resolved.

6. Check if you’re using a 64-bit version of Firefox

  1. Click the Menu button in the top right corner and choose Help.
    Firefox slow startup
  2. Now select About Firefox from the menu.
    Firefox slow to load pages Windows 10
  3. A new window will now appear showing you the version of Firefox you’re using.

If you’re using a 32-bit version, we advise you to uninstall it and switch to a 64-bit version instead.

There are several ways to uninstall an application, but if you want to remove it completely, it’s always a good idea to use an uninstaller software tool.

Uninstaller applications are designed to remove all files and registry entries associated with the application you want to remove. As a result, you’ll completely remove the application from your PC.

There are many great uninstaller applications, but our recommendation is IOBit Uninstaller due to the simple set-up process and ease of use.

7. Start Firefox in Safe Mode

  1. Make sure that Firefox is closed.
  2. Locate Firefox shortcut, press, and hold the Shift key and double click Firefox shortcut.
  3. If done properly, you’ll see a dialog box on your screen. Select Start in Safe Mode.
    Firefox slow not responding

Firefox will now start in Safe Mode. If everything is working properly, it means that one of your extensions is causing this problem. To fix the issue, do the following:

  1. Restart Firefox. Don’t start it in Safe Mode this time.
  2. Click the Menu button in the top right corner and choose Add-ons from the menu.
    Firefox Quantum slow Windows 10
  3. A list of installed extensions will now appear. Disable all extensions by clicking the Disable button next to the extension’s name. Repeat this step for all extensions.
    Firefox slow launch
  4. Now restart Firefox and check if the problem still appears. If not, the problem is definitely related to one of your disabled extensions.
  5. Enable a single extension by clicking the Enable button. Now restart Firefox and check if the issue reappears. Repeat this step until you find the problematic extension.
  6. Once you find the extension that is causing the problem, disable it or remove it.

As you can see, even though Firefox extensions are rather useful, they can cause certain problems to appear, so be sure to find and remove the problematic extensions from your PC.

8. Check if Firefox is up to date

Firefox latest version

If Firefox is slow on your PC, the problem might be a certain bug. In order to avoid Firefox bugs, it’s advised to update your Firefox to the latest version.

In most cases, Firefox will perform the update automatically, but you can always check for updates manually from Firefox.

This is rather simple and in order to do that, you just need to follow steps from Solution 6. After doing that, Firefox will check for missing updates and install them.

It can be quite frustrating when Firefox is running slow on Windows 10, but hopefully, some of our solutions might be helpful to you.

After all, Firefox is a great web browser, but sometimes you can experience slowdowns while using it.

Our tips can be applied whenever facing general slowdown problems, but also when Firefox is lagging because you have too many tabs open or when the browser crashes.

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Frequently Asked Questions

  • To make Firefox faster, make sure you clean the cache frequently. We’ve covered this topic in detail, so check it out.

  • Generally no, Firefox isn’t slower than Chrome, but the browser speed is affected by several factors including your hardware, number of open tabs and extensions.

  • To optimize Firefox, be sure to keep it updated at all times. Usually, when you optimize your entire Windows system, the browser will also perform better.

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