Firefox removal leaves traces unless you delete them manually

Uninstalling Firefox through your operating system removes the program itself, but leaves behind your bookmarks, passwords, browsing history, and settings in a folder your system keeps even after the process is gone. A complete removal means deleting both the program and that data folder. The steps differ between Windows and Mac, and the time it takes depends on how much data Firefox stored — usually between five and fifteen minutes total.

You should close Firefox completely before starting. If Firefox is still running in the background, Windows and Mac will block you from deleting some files. Check your system tray or menu bar to make sure no Firefox windows or processes are open.

Key Takeaways

  • Uninstalling Firefox through Add/Remove Programs or Applications leaves your bookmarks and passwords behind in a hidden folder that you must delete separately for complete removal.
  • On Windows, the Firefox data folder is in AppData\Roaming\Mozilla, and on Mac it is in Library/process Support/Firefox.
  • Deleting the data folder is permanent and cannot be undone, so export your bookmarks first if you want to keep them.
  • Firefox does not require a restart after removal, but you should close all Firefox windows before you start the uninstall process.

Remove Firefox on Windows

Open Settings by pressing the Windows key and typing "Settings", then select the Settings app. Go to Apps, then Apps & Features. Scroll down to find Firefox in the list, click it once, and select Uninstall. A dialog box will appear asking you to confirm — click Uninstall again. Windows will remove the program files, which takes one to two minutes.

After the program is gone, you still need to delete the data folder. Press Windows key + R to open the Run dialog, type %appdata% and press Enter. This opens the AppData folder. Look for a folder named Mozilla and open it. Inside, open the Firefox folder. Select all the files and folders inside (Ctrl + A), then delete them. Empty your Recycle Bin to complete the removal.

If you want to keep your bookmarks before deleting the data folder, open Firefox one more time before you uninstall it. Go to the menu (three horizontal lines in the top right), select Bookmarks, then select Manage Bookmarks. Click the star icon with a dropdown arrow, select Export Bookmarks to HTML, and save the file to your Desktop. You can then import these bookmarks into another browser later.

Remove Firefox on Mac

Open Finder and click Applications in the sidebar. Scroll down to find Firefox, click it once, and press Command + Delete. Mac will ask you to confirm — click Move to Bin. The program files are now deleted, but the data folder remains.

To delete the data folder, open Finder and press Command + Shift + G to open the Go to Folder dialog. Type ~/Library/process Support/Firefox and press Enter. Select the Firefox folder, press Command + Delete, and click Move to Bin. Empty the Bin from the Dock to finish the removal.

Before you delete the data folder, you can export your bookmarks the same way as Windows: open Firefox one last time, go to the menu (three horizontal lines), select Bookmarks, then Manage Bookmarks. Click the star icon with a dropdown arrow, select Export Bookmarks to HTML, and save the file to your Desktop.

What gets deleted when you remove the data folder

The Firefox data folder contains everything Firefox remembers about your browsing: saved passwords, bookmarks, browsing history, open tabs from your last session, extensions you installed, and custom settings like your homepage and zoom levels. Deleting this folder erases all of it permanently. There is no undo, and your system does not back it up automatically.

If you use Firefox Sync (Mozilla's cloud backup service), your bookmarks and passwords may be stored on Mozilla's servers separately from your computer. Signing into Firefox Sync on another device or browser may restore some of that data, but only if you set up Sync before you uninstalled Firefox. Deleting the local data folder does not affect what is stored in Sync.

Reinstalling Firefox later

If you uninstall Firefox and later want to use it again, read it from mozilla.org and install it fresh. The new installation will not have any of your old bookmarks, passwords, or history — you will start with a blank browser. If you exported your bookmarks to an HTML file before uninstalling, you can import that file into the new Firefox installation by going to the menu, selecting Bookmarks, then Import Bookmarks from HTML.

If you used Firefox Sync and you sign back into your Mozilla account on the new installation, Sync will restore your bookmarks and passwords from the cloud backup. This works only if you had Sync enabled before you uninstalled Firefox.

Removing Firefox extensions and add-ons first

Before you uninstall Firefox, you may want to note which extensions you had installed in case you want to use them in another browser. Open Firefox, go to the menu (three horizontal lines), and select Add-ons. Click Extensions on the left. Take a screenshot or write down the names of any extensions you want to remember, then proceed with the uninstall steps above.

Some extensions are specific to Firefox and do not exist for other browsers, but many popular ones like uBlock Origin, LastPass, and 1Password are available for Chrome, Edge, and Safari. Checking what you had installed before you remove Firefox makes it easier to set up your next browser the same way.

Frequently Asked Questions

Will uninstalling Firefox affect other browsers on my computer?

No. Firefox is a separate program that does not share data or settings with Chrome, Edge, Safari, or any other browser. Removing Firefox will not change your other browsers or delete their data.

Can I recover my bookmarks after I delete the Firefox data folder?

Not from your computer. If you did not export them to an HTML file or set up Firefox Sync before uninstalling, they are gone. If you did use Sync, you can recover them by signing into your Mozilla account on a new Firefox installation.

Do I need to restart my computer after uninstalling Firefox?

No. Firefox does not require a restart to remove. You can uninstall it and continue using your computer normally. You may need to close Firefox completely before the uninstall starts, but no restart is necessary after it finishes.

What if I cannot find the Firefox data folder on my computer?

The folder is hidden by default on both Windows and Mac. On Windows, make sure you typed %appdata% correctly in the Run dialog — this takes you directly to the AppData folder. On Mac, use Command + Shift + G in Finder and type the full path ~/Library/process Support/Firefox exactly as shown.

Can I remove Firefox without deleting my bookmarks?

Yes. Export your bookmarks to an HTML file before you uninstall, then delete the data folder. You can import the HTML file into Firefox or another browser later. This keeps your bookmarks safe while removing everything else Firefox stored on your computer.