Windows
Fake support alert shown in Firefox
A malicious website opened in Firefox and displayed a fake support alert telling the user to call a number. The site was closed and checked; it had not downloaded anything or changed Firefox settings.
Killed once by someone from XL.net, on 2026-02-02.
Affects
Apps
- Firefox
What you see
- A browser page or alert appears telling the user to call a support number.
Why it happens
Likely A malicious website presented a fake support/scareware alert in Firefox.
When it shows up
A user reports a browser-based fake support alert or call-now number and the page is in Firefox.
You are in this case if:
- Firefox
- A browser page that displays a support-number warning or alert
1 fix below
The steps that killed it
The steps are behind a quick check
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Someone from XL.net killed this on a Windows computer on 2026-02-02. It is written up from that one repair, so it cites no outside page.