Firefox caught 10 Trojan-backdoor programs- message; "Install Security Defender 898.exe" . I attempted to Install but Avast stopped download. Is this SecurityDefender sanctioned by Firefox?

I am still running Win XP on a Dell desktop using Avast Antivirus (licensed ).
I opened a link while working in my g-mail account.

'''''Security Defender''''' is malware posing as anti-malware.
Read and understand all of the following article.
*If you can not access the article or can not download the recommended removal software on the infected computer, then you must go to a non-infected computer to do so and transfer the recommended removal tools to the infected computer via CD/DVD or on a USB/thumb/pin/jump drive.
*See --> http://www.bleepingcomputer.com/virus-removal/remove-security-defender
Security Defender is not associated in any way with Mozilla or Firefox. It is an infection that you picked-up on the internet by downloading/installing something, by clicking on an e-mail link or through a "drive-by" download which required no action on your part. Keep your firewall and anti-virus/anti-malware application(s) updated; '''''they are your first line of defense'''''.
Firefox will protect you from '''''known''''' malware and phishing sites, but new ones are created every day and it takes a while to discover the new sites. Some malware sites are created and then disappear within a matter of days. Some legitimate sites become infected with malware or malware links and the owners of the sites do not discover the problem for some time.
'''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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