Suspicious Firefox download window

Question

An official Firefox download window was presented for a security update. I did this and a few minutes later, another window appeared mentioning an add-on Firefox update. It had a hyperlink in the window for more information about the update--but the link did nothing. I was half-asleep and can't believe I hit 'next' --it began installing. I realized in that instant it might not be a legitimate update and closed the install window before it completed--am I safe from the virus it was probably trying to put on my computer?

Answer 1

There have been quite a few bogus sites recently that purport to be an update for Firefox but are trying to get you to install malware.
To ensure that you have not been infected, try running several malware scanners. It is best to run several as each will pick up things that the others miss. Some scanners you can try are:
* [http://www.malwarebytes.org/mbam.php Malwarebytes]
* [http://www.superantispyware.com/ SUPERAntiSpyware]
* [http://www.lavasoft.com/products/ad_aware_free.php Ad-Aware]
* [http://www.microsoft.com/windows/products/winfamily/defender/default.mspx Windows Defender]
* [http://www.safer-networking.org/en/home/index.html Spybot S&D]