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by jcranmer 3306 days ago
I can't speak for Chrome or Safari, but Firefox's UA is pretty sparse:

Mozilla/5.0 (X11; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0

This a totally custom, self-compiled build--and there is absolutely no reflection of that in the UA. Also note that the Mozilla/5.0 and Gecko/20100101 fields are frozen and are only there because sites break if they're not there.