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Firefox not installing for some reason – error [Solved]

4.  Try to update the browser manually

  1. Click the Menu icon in the top right corner and choose Help from the menu.
    Hmm for some reason we could not install Firefox
  2. Now click About Firefox.
    Firefox install stuck on downloading
  3. A new window will now appear and Firefox will check for updates. If any updates are available, they will be automatically installed.
    Firefox install takes forever

Theoretically, Firefox is set to automatically install the updates, but sometimes various factors may prevent that. To check for updates manually, do the following:

5. Run Firefox as an Administrator

If Firefox install gets stuck on your PC, perhaps the issue might be related to the missing privileges. To fix this issue, it’s required to run the setup file as an administrator.

Firefox installer stuck on now installing

This is quite simple, and to do it, you just need to locate the setup file, right-click it and choose Run as administrator.

If you’re having problems updating Firefox, you just need to repeat these steps for firefox.exe and then try to update it again.

6. Check your security software

try out Bullguard

If Firefox install gets stuck on your Windows 10 PC, the issue might be your security software.

Sometimes certain antivirus features can interfere with your system, so it’s advised to disable these features. Here’s how to do that in many popular antivirus tools:


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Here’s how to disable the secure connection feature from this antivirus:

  1. Open the dashboard of Avast.
  2. Click on Settings > Active Protection > Customize.
  3. Uncheck the Enable HTTP Scanning box and click on the OK button to update this feature.

This should stop your antivirus from checking the security certificate of every website you access.


  1. Open the dashboard of Bitdefender. If you have the 2016 version, click on Modules. For an older version you must click on the Protection button.
  2. Click on the Web Protection button.
  3. Disable the Scan SSL feature.


For ESET all you have to do is to enable the SSL/TSL protocol filtering feature.

  1. Open ESET antivirus.
  2. Press F5 to open the Advanced setup menu.
  3. Click on Web and email button > SSL/TSL > Enable SSL/TSL protocol filtering >OK.
  4. Restart the computer to configure the antivirus filter.


Kaspersky has a function that can be disabled to stop filtering the websites and it is very easy to do this.

  1. Open the dashboard of the antivirus.
  2. Click on the Settings button from the bottom-left.
  3. Click on the Additional button > Network.
  4. If you are using the 2016 version, uncheck the Do not scan encrypted connections box from the Encrypted connections settings section. For an older version just, uncheck the Scan encrypted connections feature.
  5. Reboot your system to configure your antivirus software.

If disabling this feature doesn’t solve the problem, completely disable your antivirus. If the issue still persists, remove your antivirus and check if that helps.

In case that removing the antivirus solves the problem, this might be a perfect opportunity to consider switching to a different antivirus solution.

If you want an antivirus that won’t interfere with your system while providing great protection, you should consider switching to BullGuard, the best antivirus at this moment.

 Download Bullguard

7. Disable Windows Defender

  1. Open Settings first. You can do that quickly by using Windows Key + I shortcut.
  2. Go to the Update & Security section.
  3. Click Open Windows Security.
  4. Go to the Virus & Threat protection section.
  5. Now click Virus & threat protection settings.
  6. Locate the Real-time protection option and disable it. You can also disable other options if you want.

Even if you don’t use a third-party antivirus, sometimes Firefox install can get stuck on your PC.

This can be caused by Windows Defender, and in order to fix the problem, you need to disable it as described above.

After disabling this option, try to install Firefox again. If Firefox installs successfully, be sure to enable Windows Defender once again.

8. Download the full installer

full installer

In order to distribute Firefox faster, Mozilla offers two types of installers, standard and full. The difference between the two is their size.

The standard installer is lighter, so it needs to download the setup files in order to install Firefox. This can sometimes cause Firefox install to get stuck.

On the other hand, the full installer won’t download any additional files, and instead, it will install Firefox right away.

This is a simple solution, and many users reported that it works, so be sure to try it out. You can get the full Firefox installer right away.

We hope these methods will help you out with any issues you might have when trying to install the Firefox browser, especially when the installer remains stuck on now installing.

If none of these methods helped you, we strongly recommend you to get in touch with the Support department of Mozilla.

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Editor’s Note: This article was originally published in August 2016 and was revamped and updated in February 2021 for freshness, accuracy, and comprehensiveness.

This post was written by Madalina Dinita and was first posted to WindowsReport

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