Firefox will not open or launch on Windows 10

Uninstall Firefox

Firefox is the second most popular browser on the market, but sometimes it can create problems. One of these problems is when Firefox does not open. There are 2 cases for this condition. In the first case, Firefox will not open but will run in the background. In the second case, the application will not open in the background either. This may be due to missing or corrupted Firefox files, problematic add-ons, a corrupted user profile, or a driver issue.

Firefox will not be open or launched

The case where Firefox runs in the background occurs when you try to log off Firefox, but it does not actually close. Now that you know the possible causes, if Firefox does not open or launch on your Windows PC, try the following solutions to solve the problem:

  1. Check the task manager and kill the Firefox process if it is open
  2. Remove or disable some add-ons
  3. Delete Firefox user profile data
  4. Reset Firefox
  5. Reinstall Firefox

Proceed sequentially with the following solutions to resolve the problem:

1) Check the task manager and kill the Firefox process if it is open

Press CTRL + ALT + DEL to open the Security options menu. To select Task Manager from the list to open it.

Check the list of processes that are running. If you find Firefox in the list, right-click on it and select Final process to kill him.

Try to open Firefox again, and it will work.

2) Remove or disable problematic add-ons

Disable suspicious extensions

Bad add-ons are known to cause problems with the Firefox browser. However, it would be difficult to solve the problem because you can not open the browser at all.

In such a situation, try to open Firefox by pressing the button OFFSET button. This will open the browser in Safe mode (if at all it does)

Then open the add-ons page by entering about: addons in the address bar.

in the Extensions tab, disable any unverified, suspicious, or less known extensions.

Now, try to open Firefox in normal mode and check if it works properly.

3) Delete the data from the Firefox user profile

The procedure to delete data from the Firefox user profile is as follows:

Press Win + R to open the Run window and type the command. %% application data and press Enter.

In the window that opens, right-click the Mozilla folder and select Delete. Remember that when you do this, you will lose your configuration and other data.

Restart the system.

4) Reset Mozilla Firefox

If you do not solve the problem, the problem may come from the Firefox application itself. In this case, you may consider resetting the Mozilla Firefox application. This will reset many browser settings that you may have changed over time.

5) Uninstall Firefox, then delete all the residue folders.

If any files associated with the Firefox browser have been corrupted, you may consider uninstalling the browser and then deleting all files. It should be noted that in doing so, you are not likely to harm information stored on the cloud.

The application can be reinstalled later.

Press Win + R to open the Run window and type the command. appwiz.cpl. Press Enter to open the Programs and Features menu.

Right click on Mozilla Firefox and select uninstall.

Uninstall Firefox

Once Firefox is completely uninstalled, reboot the system.

Go to the path C: Program Files in the File Explorer and locate the Mozilla Firefox folder.

Right click on it and select Wipe off. You will need the permission of the administrator for this.

Delete the Firefox folder

Repeat the same process for the path C: Program Files (x86).

You can now download and reinstall it from the company's website.

I hope it helps!

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