We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thread ini telah diarkib. Sila tanya soalan baru jika anda perlu bantuan.

Why do I get an error 21 notice when I try to uninstall Firefox betta?

  • 1 balasan
  • 9 ada masalah ini
  • 20 paparan
  • Balasan terakhir oleh Xircal

fionaomahoney@hotmail.co.uk
[email protected]
more options

I was having problems with Firefox repeatedly crashing and decided to uninstall and reinstall. I'm a bit new to IT and installed MF 4.0 beta 11. I was told by my son that this is a trial version which I shouldn't really use until my knowledge is better. I tried to uninstall MF beta 11 but keep getting an error 21 notice. I installed MF 4.0 in the hope that it would uninstall the beta version but that hasn't happened. How do I get rid of the beta version?

I was having problems with Firefox repeatedly crashing and decided to uninstall and reinstall. I'm a bit new to IT and installed MF 4.0 beta 11. I was told by my son that this is a trial version which I shouldn't really use until my knowledge is better. I tried to uninstall MF beta 11 but keep getting an error 21 notice. I installed MF 4.0 in the hope that it would uninstall the beta version but that hasn't happened. How do I get rid of the beta version?

All Replies (1)

Xircal
Xircal
more options

Please do the following.

Go to Download Firefox 4.0.1 and download a fresh installation file to the desktop.

Then go to Add/Remove Programs in Windows Control Panel, scroll down to Mozilla Firefox and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box).

Then reboot and delete the folder called Mozilla Firefox at this location: C:\Program Files\Mozilla Firefox

Finally run the installation file you downloaded to the desktop earlier.

Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

After you complete the installation, go to the Plugins Check page and update those if necessary.