How to Uninstall Firefox

By Aaron Parson

If you tried out Mozilla Firefox and decided it just wasn't for you, remove the program to switch back to your old Web browser, such as Internet Explorer. Erasing Firefox requires three basic tasks: deleting your profile data, uninstalling the program and selecting a new default browser. Before you start, consider [exporting your bookmarks]( if you want to keep them, as uninstalling Firefox erases them permanently.

Step 1

Close Firefox if you are using it, but first open this page in another Web browser or [print the page]( to follow these directions. Once Firefox is closed, press "**Windows-R**" to open the Run dialog box. Run the command "**%APPDATA%**" to open the folder on your computer that stores application settings.

Step 2

**Select the "Mozilla" folder and press "Del" to delete it.** If you want to continue using another Mozilla product, such as Thunderbird, open the folder and delete the "Firefox" subfolder instead. If you might want to return to Firefox later, skip this step -- the folder does not take up much space on your computer, and you can leave it behind without any problems.

Step 3

Search for and open the "**Programs and Features**" Control Panel. Press "Windows-W" to search for Control Panel on Windows 8, or use the search bar in the Start menu on Windows 7.

Step 4

Select "Mozilla Firefox" in the program list and press "Uninstall."

Step 5

Click "Next" to remove Firefox.

Step 6

Search for and open the "**Default Programs**" Control Panel to select a new default Web browser. If you are about to download and install a new Web browser, skip this step and the remaining steps.

Step 7

Click "**Set Your Default Programs.**"

Step 8

Select "Internet Explorer" -- or another Web browser, such as "Google Chrome" -- and press "**Set This Program as Default**" to automatically open websites using the selected browser.

Tips & Warnings

  • To delete a single Firefox profile while leaving others on your computer, close Firefox if it is running, then press "Windows-R" and run the command "firefox.exe -p" to show the Profile Manager. Do not delete the only profile folder from the Mozilla folder found in %APPDATA%, as this method can cause an error if you try to use Firefox again.
  • You don't need to uninstall Firefox to use another Web browser. Multiple browsers work side-by-side on the same computer. If you don't see your old browser's icon on the desktop, but you don't remember uninstalling it, search for it by name on the Start screen or Start menu.
  • Versions of Firefox prior to 31 include the "Remove My Firefox Personal Data and Customizations" option in the uninstaller, allowing you to skip the manual deletion of the "Mozilla" folder. Current versions do not have this feature, however.
  • Deleting the "Mozilla" or "Firefox" folder permanently erases your Firefox profile data, meaning you'd need to set up the program from scratch if you download it again.