I got a Firefox alert My PC may have a serious virus! Is this legitimate

I got the following message on my computer screen, is it legitimate, should I respond to it or ignore it?.
Firefox-Alert!
Warning: Your PC may have a serious virus!
Browser: Firefox 34.0
OS: Windows
If you are seeing this message you need to call Windows Support XXX (TOLL FREE) immediately.
Technicians are awaiting for you call for FREE DIAGNOSIS & PRIORITY assistance removing malicious viruses from your PC.
browser.hijacker.spy/trojan.fakeAV-download
Help! Please respond if such message is legitimate or I should Ignore it. Thank you.
edit: removed fake hotline number. (philipp)

Please scan your computer for Malware. Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/viruses/disinfection/5350 Anti-Rootkit Utility - TDSSKiller]
* [http://general-changelog-team.fr/en/downloads/viewdownload/20-outils-de-xplode/2-adwcleaner AdwCleaner] (for more info, see this [http://www.bleepingcomputer.com/download/adwcleaner/ alternate AdwCleaner download page])
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

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Manufacturer: Mozilla
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I got a Firefox alert My PC may have a serious virus! Is this legitimate

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