Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Mij stipescams. Wy sille jo nea freegje in telefoannûmer te beljen, der in sms nei ta te stjoeren of persoanlike gegevens te dielen. Meld fertochte aktiviteit mei de opsje ‘Misbrûk melde’.

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system blocked by intruder

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  • Lêste antwurd fan Paul

I am running an iMac that is about eight years old.This afternoon my Firefox browser was taken over by a "warning" from "MacOS security center" that I should go to THEIR macOS support site to get my system unfrozen. The number they give is 1-877-xxx-xxxx. I cannot get this intruder to go away, even by restarting the computer.

I am running an iMac that is about eight years old.This afternoon my Firefox browser was taken over by a "warning" from "MacOS security center" that I should go to THEIR macOS support site to get my system unfrozen. The number they give is 1-877-xxx-xxxx. I cannot get this intruder to go away, even by restarting the computer.

Bewurke troch James op

Keazen oplossing

Hi

As a first step, please can you try clearing your browsing history. This support article should help:

https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

Further to this, have you installed any add-ons recently or perhaps other apps on your device?

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Keazen oplossing

Hi

As a first step, please can you try clearing your browsing history. This support article should help:

https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox

Further to this, have you installed any add-ons recently or perhaps other apps on your device?