Reinstall Firefox and Restore Performance

Mozilla Firefox is one of the most popular open source web browsers known for its speed, security, and customization options. However, like any software, it may encounter issues over time. Users report that Firefox not opening, the browser not respond on startup, and Firefox can’t load websites but other browsers can. Various reasons why Firefox not working Windows 11 or 10 such as corrupted files, incompatible extensions, malware infections and more. This article explores how to repair, reset Firefox without losing data. In addition, we also see how to completely remove and reinstall Firefox to fix common problems and restore its performance.

What Causes Firefox Not Working on Windows 11?

There are multiple reasons cause Firefox not working or not responding on Windows 11. Outdated versions to corrupted user profiles, conflict add-ons or extensions, or Corrupted Installation Files are common.

  • A corrupted user profile can lead to various issues, such as crashes, slow performance, and problems with saved settings.
  • Using an outdated version of Mozilla Firefox may result in compatibility issues with websites and cause performance problems.
  • Incompatibility or corruption of browser extensions can cause Firefox to malfunction or become unresponsive.
  • Problems with internet connectivity or network configurations can prevent Firefox from loading pages and working correctly.
  • Issues with hardware acceleration settings can result in graphical glitches, crashes, or performance problems in Firefox.
  • Unintended changes to advanced settings or configurations may result in unexpected behavior and prevent Firefox from working as intended.

Ensure Firefox is updated

Whenever you experience problems such as Firefox not working, not loading webpages or not responding at start the first thing we recommend update the browser latest version. This will address security vulnerabilities, compatibility issues with modern websites and provide a better browsing experience.

  1. Click on the menu icon (three horizontal lines) in the upper-right corner.
  2. Select ‘Help’ and then click on ‘About Firefox.’
  3. Firefox will automatically check for updates. If available, follow the prompts to download and install.
  4. Click ‘Restart to update Firefox’ after installation.

update Firefox

This can address compatibility, security, and performance concerns, potentially fixing the not working or not responding problem.

Note: If you have a problem updating Firefox to the latest version, download the Firefox installer, close your browser, and launch the installer to update Firefox while preserving your data.

How to repair Firefox Windows 11

If Firefox is crashing, freezing, or displaying error messages, you may try to repair it by using the Refresh Firefox feature. This feature will restore Firefox to its default state while saving your essential information like bookmarks, passwords, and history.

  • Click the menu button (three horizontal bars) in the upper-right corner of the browser window and select Help.
  • From the Help menu, choose Troubleshooting Information.

Firefox Troubleshooting information

  • Click the Refresh Firefox button in the upper-right corner of the Troubleshooting Information page.

Refresh Firefox

  • Confirm that you want to refresh Firefox in the dialog box that appears.
  • Firefox will close and restart with a fresh profile.

Note: If Firefox won’t open on your PC, here is tweak to repairing Firefox without opening it. Press and hold the “Shift” key on your keyboard, and double-click the Firefox shortcut to open it.

In the “ Use this special mode of Firefox to diagnose problems ” dialog box, click the “ Rrfresh Firefox ” button.

Refresh Firefox browserIn the “ Repair Firefox by reverting to default settings ” dialog box , click the “ refresh Firefox ” button again. Your extensions and customizations will be removed from the web browser, but you will keep your essential information like your bookmarks or passwords.

How to Reset Firefox Windows 11

If refreshing Firefox does not solve your problem, or if you want to start over with a clean slate, you may try to reset Firefox by creating a new profile. A profile is a set of files that store your personal settings and preferences for Firefox. By creating a new profile, you will lose your extensions, themes, and customizations, but you will keep your bookmarks, passwords, and history.

  • Close Firefox if it is running, Press the Windows key + R, type firefox.exe -P and click OK.
  • The Profile Manager window will appear, Click the Create Profile button.

Create Firefox profile

  • Follow the on-screen instructions to create a new profile. You can give it any name you like. Select the new profile and click Start Firefox.

How to Reinstall Firefox on Windows 11

If refreshing or resetting Firefox profile didn’t work for you or if you encounter problems with installing or updating Firefox, you may try to reinstall Firefox by downloading and running the latest installer from the official website. Reinstalling Firefox will overwrite your current version and fix any issues with the installation files. However, it will not affect your profile or personal data.

Note: If you want to export your login credentials stored in Firefox, type ” about:logins” in the Firefox address bar, and press the “Enter” key. Then click on the three horizontal dots, and select “Export credentials” from the context menu.

To reinstall Firefox

  • Uninstall Firefox from your computer by using the Windows Control Panel or settings -> Installed apps section.

Uninstall Firefox

Next press Windows key + R, type %LOCALAPPDATA%\Mozilla and click ok. Here delete the “Firefox” folder. Again open Run using Windows key + R, type %APPDATA% click ok. Open the “Mozilla” folder, and delete the “Firefox” folder.

  • Download the latest version of Firefox from

Download Firefox

  • Run the installer and follow the on-screen instructions to complete the installation.

Why and when should you try to repair or reinstall Firefox?

Repairing or reinstalling Firefox can help you solve many common problems that affect your browsing experience, such as crashes, errors, slow performance, or unwanted changes. You should try to repair or reinstall Firefox if:

  • You have tried other troubleshooting steps, such as clearing the cache, disabling extensions, or scanning for malware, but they did not work.
  • You have recently updated Firefox or installed a new extension or theme that caused problems.
  • You suspect that your Firefox files are corrupted or missing due to a disk error, a virus attack, or a power outage.
  • You want to start fresh with a new profile or a new version of Firefox.

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Steve Ballmer
With over 7 years of experience in the IT industry, I have experience in IT support, helpdesk, sysadmin, network admin, and cloud computing. Certified in Microsoft Technologies (MCTS and MCSA) and also Cisco Certified Professional in Routing and Switching.