Here’s how to completely Remove Mozilla Firefox.
Back Up Your Data First
Before you begin, save anything important from Firefox. This includes Bookmarks, and you should also save Saved passwords. Keep Browser history if you need it, and preserve 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. Open Windows Settings (Windows key + I), then go to Apps > Apps & features. Find "Mozilla Firefox" in the list. Click the three dots and select "Uninstall".
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 C:\Program Files\Mozilla Firefox (or C:\Program Files (x86)\Mozilla Firefox) if it still exists. Next, manually delete C:\Users\[YourUsername]\AppData\Local\Mozilla if it still exists. Then manually delete C:\Users\[YourUsername]\AppData\Roaming\Mozilla if it still exists.
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 HKEY_CLASSES_ROOT\FirefoxHTML if it exists. After that, delete HKEY_CURRENT_USER\Software\Mozilla if it exists. Delete HKEY_CURRENT_USER\Software\MozillaPlugins if it exists. Delete HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla if it exists.
Delete HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins if it exists. 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
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.Restart your computer
- 2.Try deleting the files immediately after startup
- 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.
