How to Completely Remove Mozilla Firefox

Here’s how to completely Remove Mozilla Firefox.

Back Up Your Data First

Before you begin, save anything important from Firefox. This includes:

• Bookmarks
• Saved passwords
• Browser history
• Any custom settings

You can export bookmarks through the Library menu (Ctrl+Shift+B) and save passwords through Firefox's built-in password manager.

Step 1: Uninstall Firefox Through Windows

Start with the basic uninstallation:

1. 1.Open Windows Settings (Windows key + I)
2. 2.Go to Apps > Apps & features
3. 3.Find "Mozilla Firefox" in the list
4. 4.Click the three dots and select "Uninstall"
5. 5.Follow the prompts to remove the browser

This removes the main program files but leaves behind your personal data and some system entries.

Step 2: Delete Remaining Firefox Folders

After uninstalling, manually delete these folders if they still exist:

• C:\Program Files\Mozilla Firefox (or C:\Program Files (x86)\Mozilla Firefox)
• C:\Users\[YourUsername]\AppData\Local\Mozilla
• C:\Users\[YourUsername]\AppData\Roaming\Mozilla

To access AppData folders, open File Explorer and type %APPDATA% in the address bar, then navigate up one level to find the Local folder.

Step 3: Clean the Windows Registry

Firefox leaves entries in the Windows Registry that should be removed. Important: Back up your registry before making changes.

Open Registry Editor (type "regedit" in the Start menu) and delete these keys if they exist:

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• HKEY_CLASSES_ROOT\FirefoxHTML
• HKEY_CURRENT_USER\Software\Mozilla
• HKEY_CURRENT_USER\Software\MozillaPlugins
• HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla
• HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins

Be very careful when editing the registry - deleting the wrong entries can cause system problems.

Using Third-Party Tools

If you prefer an automated approach, several programs can handle complete Firefox removal:

• CCleaner: Removes program files, cache, and registry entries
• Revo Uninstaller: Scans for leftover files and registry keys after uninstall
• Geek Uninstaller: Free tool that performs deep cleaning

These tools are particularly useful if you're dealing with stubborn installation issues or want to ensure everything gets removed.

Troubleshooting Common Issues

Firefox Crash Reporter Won't Go Away

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Sometimes the Mozilla Crash Reporter continues to appear even after uninstalling. This usually means Firefox files are still running in the background. Check Task Manager for any Firefox-related processes and end them before continuing with removal.

Can't Delete Certain Files

If you encounter "file in use" errors when trying to delete Firefox folders:

1. 1.Restart your computer
2. 2.Try deleting the files immediately after startup
3. 3.Use an unlocker tool if files remain locked

Reinstalling Firefox Later

If you plan to reinstall Firefox after complete removal, you'll start with a clean profile. This can actually help resolve persistent performance issues or crashes you were experiencing before.

Complete removal ensures no old settings or corrupted files interfere with a fresh installation.