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DL'd most recent Firefox and got PUP.Optional.OutBrowse warning

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So last week I had trouble with three unwanted programs...BonanzaDeals, Adpeak and GreatArcadehits. These made their presence known by generating pop-ups in my Firefox browser. 


I went to Bleeping Computer where I was helped through the process of cleaning my W7 64 bit machine. I switched to the Chrome browser as a result of all the problems with Firefox. So after days of no problems I thought I would revert to Firefox because I like it better. I visited their site and downloaded the most recent version and once the download was complete I got a warning from Malwarebytes that I had downloaded a potentially unwanted program. Specifically PUP.Optional.OutBrowse


The file was in my Download folder and I quarantined it with Malwarebytes.


Is this a false positive?

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