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How can I close Firefox on Windows10 when the browser in 'invisible' (even in Task Manager)?

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I'm no longer able to use Firefox: When I select a shortcut or try to open Firefox from Program Files, nothing happens. But when I try to un-install Firefox, I'm being told to close Firefox before I'm able to continue to un-install. Which is strange, because Firefox is not (visibly) running.

There are also no Firefox-related programs listed in Task Manager. Is there another way to delete/force-stop Firefox?

I'm no longer able to use Firefox: When I select a shortcut or try to open Firefox from Program Files, nothing happens. But when I try to un-install Firefox, I'm being told to close Firefox before I'm able to continue to un-install. Which is strange, because Firefox is not (visibly) running. There are also no Firefox-related programs listed in Task Manager. Is there another way to delete/force-stop Firefox?

Asịsa ahọpụtara

The problem has been solved. After resetting Firefox appeared in Task Manager, thus I could close Firefox succesfully.

Gụọ azịza a na nghọta 👍 1

All Replies (3)

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Hi, try holding down the Shift key when you start Firefox to start in Safe Mode. More - Diagnose Firefox issues using Troubleshoot Mode.

If it works in Safe Mode, disable any theme or add-ons you have - Add-ons Manager (Ctrl+Shift+A) > Themes/Extensions and restart Firefox; then if it's OK, re-enable them one by one until you find the culprit. You may need to restart Firefox after enabling some add-ons.


If that doesn't help, try performing a Clean reinstall. This means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location.

To do a clean reinstall of Firefox, please follow these steps: Note: You might want to print these steps or view them in another browser.

  1. Download the latest Desktop version of Firefox from mozilla.org (or choose the download for your operating system and language from this page) and save the setup file to your computer.
  2. After the download finishes, close all Firefox windows (or open the Firefox menu New Fx Menu and click the close button Close 29).
  3. Delete the Firefox installation folder, which is located in one of these locations, by default:
    • Windows:
      • C:\Program Files\Mozilla Firefox
      • C:\Program Files (x86)\Mozilla Firefox
    • Mac: Delete Firefox from the Applications folder.
    • Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
  4. Now, go ahead and reinstall Firefox:
    1. Double-click the downloaded installation file and go through the steps of the installation wizard.
    2. Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.

More information about reinstalling Firefox can be found here.

WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See Back up and restore information in Firefox profiles.

Please report back to say if this helped you!

Thank you.

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Thanks for your answer,

unfortunatly, I was not able to open Firefox in Safe Mode. Selecting Firefox with or without pressing the Shift-key has no effect whatsoever. As I'm not able to open a Firefox-window, I cannot access the Firefox menu.

I tried installing the latest version of Firefox, but I get the same message as when I tried to un-install: "Firefox must be closed to proceed with the (un)install, please close Firefox to continue."

Are there other ways to close Firefox, when Firefox does not respond, and is invisible on my desktop and Task Manager?

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Asịsa Ahọpụtara

The problem has been solved. After resetting Firefox appeared in Task Manager, thus I could close Firefox succesfully.