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App indésirable named update for firefox 57.0 appears and blocks computer no way to escape but shutdown, are you aware ?
On the site Extreme Download, an undesirable app appears and blocks computer asking to click in. Only way to get out is to shutdown. Same on this site and others as faked alert Microsoft blocking the screen and asking to call a number...
While tapping the ESC key you can middle-click the Tab to close it.Ανάγνωση απάντησης σε πλαίσιο 👍 1
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seems you have contacted some form of malware, i suggest scanning for threats.
Start with this support article: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.
While tapping the ESC key you can middle-click the Tab to close it.