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Can’t set Firefox as my Windows 10 default browser [Solved]


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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 button.windows 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 that 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.


FAQ: Learn more about Firefox

  • How do I permanently set my default browser in Windows 10?

We recommend you to follow the steps provided in our guide on how to set Firefox as your default browser.

  • Is Firefox a stable browser?

Yes, Firefox is generally very reliable, but it is not uncommon to also experience issues. Take a look at our guide on how to fix Firefox crashes.

  • Why is Firefox not installing?

This is usually a problem generated by your antivirus solution. Our guide including solutions to fix Firefox installation issues is exactly what you need.

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Editor’s Note: This article was originally published in July 2018 and was revamped and updated in February 2021 for freshness, accuracy, and comprehensiveness.



This post was written by Aleksandar Ognjanovic and was first posted to WindowsReport

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