Firefox uses pop - ups advertising for revenue?

I think installation of Firefox, but I don't believe in a "free" lunch ERGO my question.
How can 'give away' Mozilla Firefox? It is supported by advertising pop-ups or sale of navigation data collected?

This has happened

Don't know how many times

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729 .NET CLR 3.0.30729; Media Center PC 6.0; NET4.0C)

The only advertisement popup you get overrides popup blocking is against malicious software, already installed on your system to your browser hijacking. This is all browsers, not just Firefox.

How do we know this? Popups will never happen on non-windows operating systems where there is no malware.

Tags: Firefox

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