Can’t set Firefox as my Windows 10 default browser

Aleksandar Ognjanovic
by Aleksandar Ognjanovic
Troubleshooting Expert
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  • Firefox is one of the most popular 5 browsers in the world thanks to top-notch features it packs.
  • Windows 10 comes with a built-in browser that's initially set as the default browser. Edge is a promising browser but it's not yet perfect.
  • If you want to ditch your current browser and try Firefox but you can't set it as your default browser, we compiled this list of solutions for you. This guide is part of our Firefox troubleshooting hub.
  • We got a nice collection of guides on how to improve your browsing experience on Windows 10. Do you want to check them out?
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Even though Microsoft is doing their best to enforce Edge, the majority of users is quite satisfied with what the likes of Chrome and Firefox have to offer.

You should be able to choose an alternative browser and set it as your default internet-surfing tool. However, some users reported that they were, after multiple tries, unable to set Firefox as their default browser in Windows 10.

Making the simplest of steps quite a chore. But, it can be fixed and we provided the steps below.

If you’re unable to make Firefox your default browser, make sure to follow the instructions we listed below.

How do I set Firefox as the default browser?

  1. Consider using a different browser
  2. Change the Default browser in Settings
  3. Reset Settings and assign default programs again
  4. Set Program associations individually
  5. Reinstall Firefox

1. Consider using a different browser

It nothing worked, maybe you should give up setting Firefox as your default browser altogether. Instead, try installing Opera

While not as popular as Firefox, Edge or Chrome, those who installed it said they don’t need any other browser.

Opera is fast, lightweight, and secure. You will definitely notice a significant difference in terms of speed and responsiveness compared to other browsers you’ve used.

So, if all the other browsers out there disappointed you badly due to technical glitches or privacy issues, switch to Opera.

Why not use a better alternative if it’s already available for free?



Enjoy a fast and error-free browsing experince with Opera, and never go back to a differnet browser again.

2. Change the default browser in Settings

  1. Press Windows key + I to open the Settings app.
  2. Choose Apps.
  3. Select Default apps from the left pane.
  4. Scroll down and click on “Web browser“.windows 10 won't allow firefox as default browser
  5. Choose Firefox from the list.

First things first. Even though the default browser can be set within the browser settings, it might fail. It works most of the time, but a safer route is to navigate to Settings.

There, you can select Firefox as the default browser. After that, you should be able to open all web links and associated files with Firefox.

3. Reset Settings and assign default programs again

  1. Press Windows key + I to open the Settings app.
  2. Open Apps.
  3. Select Default apps from the left pane.
  4. Scroll down and click on the “Reset” 10 won't allow firefox as default browser
  5. Assign all main programs and choose Firefox from the list of available browsers.

Is the issue persisting? Don’t worry, there are still a few ways to resolve it. Let’s get back to Settings and reset all default programs to default values. After that, restart your PC.

Make sure that you’re using the full Mozilla Firefox version which is installed. If it’s some kind of portable Firefox, it won’t create the registry entry. Which means that it can’t be recognized by Windows 10.

4. Set Program associations individually

  1. Open the Settings app.
  2. Open Apps.
  3. Select Default apps from the left pane.
  4. Click on the “Choose default apps by file type“.windows 10 won't allow firefox as default browser
  5. Replace all Edge/Internet Explorer/Chrome associated files with Firefox and confirm changes.

Besides the global settings for the most common system use (default browser, email client, calendar etc.), there are file associations, as well.

You can associate certain programs with certain file extensions and they’ll be, by default, accessed with that program solely. In this case, you can assign all relevant extensions to Firefox.

5. Reinstall Firefox

And, finally, reinstallation might help as well. As we already explained, the system creates the registry input when Firefox is installed. However, if the installation gets corrupt or incomplete, it might skip on listing Firefox as a relevant browser.

That’s why you should reinstall it and, after you set it up, check the Default apps section again. We suggest installing Firefox in architecture which corresponds to your system architecture.

With that said, we can conclude this article. Hopefully, you were able to assign Firefox as the default browser after these steps.

In case you have an alternative solution or something you would add or subtract, feel free to tell us in the comments section below.

The above-mentioned solutions will also help you if you are interested in the following topics:

  • Make Firefox default browser
  • How to make Firefox default browser
  • Make Firefox default browser Windows 10
  • Can’t set Firefox as default browser Windows 10

FAQ: Learn more about Firefox

  • Is Firefox any good?

Yes, and that is why Firefox is one of the most popular browsers in the world.

  • Is Firefox a stable browser?

Yes, Firefox is generally very reliable, but it is not uncommon to also experience issues such as crashes from time to time.

  • Can I use Google Maps on Firefox?

Under normal conditions, Google Maps should work on any browser. If you have issues running this app on Firefox, check out this guide for more help.

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

Editor's Note: This article was originally published in July 2018 and was revamped and updated in September 2020 for freshness, accuracy, and comprehensiveness.
  • Windows 10 is not allowing Firefox browser as default. Microsoft support technicians tried for more than 6 hours and could not fix the issue. No available contact phone number nor email address for Mozilla Firefox.If anyone has a solution please share it!