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I received an update download to firefox with an unknown address on 12-14-16. How do I check to see if it was really from mozilla?

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firefox-patch.js 12/14/16 8:20am java script file 10KB

firefox-patch.js 12/14/16 8:20am java script file 10KB

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hi, this is a scam tactic that is trying to trick you into installing malware, so don't download or execute this kind of stuff just because of a popup or redirect on a website! updates are handled automatically by firefox so you don't have to download anything for that (and you can always initiate a manual check for updates in the firefox menu ≡ > help ? > about firefox).

we suspect this is coming form "malvertising" (=ads placed on legitimate websites that redirect you to this fraudulent message), so using an adblocking addon like https://addons.mozilla.org/firefox/addon/ublock-origin/ would also help with that.

I found a fake Firefox update

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whiteol said

How do I check to see if it was really from mozilla?

The fake firefox-patch.js is always from a random name site and not from a *.mozilla.org page should raise a flag.