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HomeSoftware 20238 Fixes to Try if Firefox Won't Install on Windows

8 Fixes to Try if Firefox Won’t Install on Windows


Firefox is one of the most popular and preferred browsers globally. It’s fast, secure, and has many features that make web browsing enjoyable. However, some Windows users find it challenging to install Firefox. When they try to install it, they get this error message: Hmm. For some reason, we could not install Firefox. Choose OK to start over.

So, if you also face this issue, here are some steps you can take to get Firefox on your PC. But before that, let’s check why you get this error in the first place.

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Why Does Firefox Fail to Install on Windows?

Firefox is a widely used internet browser on Windows, but sometimes installation issues arise. It could be due to the following reasons:

  1. Incompatibility with Your Windows Version: Firefox releases updates regularly, and sometimes the latest version may not be compatible with older Windows versions.
  2. Disk Space Issues: The Firefox installation may fail if your computer does not have sufficient free disk space. Ensure you have enough disk space to accommodate the installation.
  3. Failure to Meet System Requirements: Firefox has minimum hardware and software requirements for a successful installation. If your computer does not meet these requirements, the installation may fail.
  4. Conflicts with Your Security Software: Antivirus or security software running on your computer sometimes interfere with installing apps.
  5. Windows Update Issues: Outdated or missing Windows updates can cause software installation problems. If you have any pending updates, install them.
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1. Check the System Requirements

AMD powered desktop computer

Ensure your system meets the minimum requirements of Firefox before trying any of the solutions below. Firefox works best on Windows 7 or later operating systems, with at least a Pentium 4 processor that supports SSE2 instructions.

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If you use the 32-bit version, you should have 512MB of RAM, whereas 64-bit users need 2GB. Additionally, make sure you have 200MB of available hard drive space. Firefox may not install or operate correctly if your system fails to meet these requirements.

2. Check Your Internet Connection

If you meet the minimum requirements but cannot install Firefox, ensure your Internet connection is stable. Check the strength of your network signal by running a speed test on your computer. You can use any of these free speed-testing apps to check your speed. If you’re using a wireless connection, try moving closer to the router or using an Ethernet cable instead.

To help fix your other internet woes, see our guide for all the information you need to fix your Internet connection.

3. Temporarily Disable Your Antivirus Software

Having antivirus software installed on your system may prevent Firefox from installing. Many users reported that their third-party antivirus software blocked Firefox from installation.

If you use Windows Defender, temporarily disable it from the Windows Defender Security Center. This will allow you to install Firefox without disruptions.

  1. Right-click on Start and select Settings from the menu list.
  2. On the left, click Privacy & security.
  3. Go to the right side of the screen and click Windows Security.
  4. Next, click Open Windows Security.
    Open Windows Security

  5. On the Windows Security screen, click Firewall & network protection.
  6. Select the Private network from the available profiles.
  7. Click the toggle to disable Microsoft Defender Firewall.
    Disable Microsoft Defender Firewall

Similarly, you can disable the firewall for Public and Domain network profiles and install Firefox. Once you perform the above action, try installing Firefox. If it works now, you can enable your antivirus software again. But if you still have issues, you can check out these other ways to disable the Microsoft Defender Firewall.

4. Run the Installer As Administrator

If you’re having trouble installing Firefox, try running the installer with administrative privileges. This will ensure that all necessary authorizations are given during installation.

Here’s how to do it.

  1. Press Win + E on your keyboard to open File Explorer.
  2. Navigate to the folder where you downloaded the Firefox installer.
  3. Right-click on the setup file and select Run as administrator.
    Run Firefox installer as administrator

  4. If the User Account Control window appears, click Yes to confirm.

The installation process will now run with administrator privileges. Now follow the on-screen instructions and see if you can finish the installation.

5. Install in Safe Mode

This solution requires you to restart your computer in Safe Mode and try installing Firefox from there. Safe Mode is a diagnostic mode on Windows that starts the computer with only essential software and drivers. If there is any third-party software interfering with the installation, this should solve the problem.

6. Download the Offline Installer

If you still fail to install Firefox, try downloading and running an offline installer. This will bypass any issues caused by unstable Internet connections or online installation files. Here’s what you need to do:

  1. Open the Firefox offline installer download page.
  2. Select your preferred installer (Windows 32-bit/64-bit).
  3. Choose the language from the drop-down menu.
  4. Click the Download Now button to download the offline installer.
  5. Once the file is downloaded, go to the folder and double-click the setup file.
  6. Continue with the on-screen instructions to finish the installation.

After you perform the above actions, Firefox should install correctly on your system. If you still have problems, clear the temporary files or use a different web browser.

7. Clear the Temporary Files

Sometimes temporary files can cause issues with the installation process. To fix this issue, delete all temporary files from your system and try installing Firefox again. Here’s how.

  1. Run the command prompt as an administrator.
  2. In the Command Prompt window, type the following and hit Enter:
    del /q/f/s %TEMP%\*

This will delete all the temporary files from your system. You can also check out these other ways to clear temporary files, to ensure that nothing gets left behind. Once you’ve completed these steps, try installing Firefox and see if that works.

8. Check for Pending Updates

Older operating system versions may contain bugs that interfere with Mozilla Firefox installation. So, install any pending updates, including service packs and patches, then try installing Firefox again.

To update Windows, follow these steps.

  1. Press Win + I on your keyboard to open the Settings menu.
  2. In the left sidebar of the Settings menu, click Windows Update.
  3. Click Check for updates in the right pane.
    Check for updates

This will check for any available updates and install them automatically. You can also try these ways to update Windows manually to ensure your computer has the latest version of its operating system. After installing the update, restart your computer and try installing Firefox again.

Install Firefox on Your Windows PC

Firefox is a popular and favored browser due to its speed, security, and enjoyable web browsing features. However, installing the browser can be challenging at times. But with these solutions, you can get Firefox on your PC without hassle.


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