This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

Este fío arquivouse. Faga unha nova pregunta se precisa axuda.

Redirect 21 is attacking my computer when i use firefox, It does not when i use Edge. How do i fix it

Peter Benson
Peter Benson
more options

I have used Firefox for more than 10 years. for the past week Redirect 21(malware) has been attacking my computer, but blocked by Norton. It only occurs when I use firefox. I have tested Edge in the past 3 days and when browsing there is no attack by Redirect 21.

What is the issue with Firefox and how do i fix this?

PB

I have used Firefox for more than 10 years. for the past week Redirect 21(malware) has been attacking my computer, but blocked by Norton. It only occurs when I use firefox. I have tested Edge in the past 3 days and when browsing there is no attack by Redirect 21. What is the issue with Firefox and how do i fix this? PB

All Replies (3)

WestEnd
WestEnd
more options

This means malware infections and you need to boot in Safe Mode to clean out the infections if you want to continue to use your computer. This is something FF forum can't help with and you need to get a computer shop to fix this malware problem.

FredMcD
FredMcD
more options

You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

It could be the work of one of your add-ons.

Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)

In the Add-ons Manager, on the left, select Extensions. Disable a few add-ons, then Restart Firefox.

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All Of them.

If the problem continues, disable some more (restarting FF). Continue until the problem is gone. After, you know what group is causing the issue. Re-enable the last group ONE AT A TIME (restarting FF) until the problem returns.

Once you think you found the problem, disable that and re-enable all the others, then restart again. Let us know who the suspect is, detective.

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
more options

Kudos to Norton, they blocked a malicious ad from loading!

More info on this detection: https://www.symantec.com/security_response/attacksignatures/detail.jsp?asid=28173

It's possible the attackers are not targeting Edge users right now. The attacks seem to come in waves as they discover a new tactic that tricks users into clicking or bypasses the most common protections (ad blockers using popular filters).