Firefox has weird search engine that just appeared...

I take it you were not running NoScript? Not that that would have prevented it necessarily
 
Not, I wasn't running that. I think I got it though. I ran adware cleaner and it seems to have gotten rid of it. Yikes. I was worried for a minute.
 
Most likely some site you visited had a redirect to some popup that was infected.
Clear them out then run a full system scan to see if they are gone.

If your AV has a pre-OS boot scan option run that too to catch it before it loads.

PUP are also included in many free programs, sadly Crystaldiskmark and info have them.
I let MWB grab them before the program installs.
 
I would nuke the whole system, but some would call that overreacting.

I would second this action, and relegate Windows to just gaming. For everything else, there is Ubuntu or other modern Linux distro. Run Windows in a VM for productivity applications if you need to. And try not to surf the web on Windows. Less headaches. :D
 
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