What a wild experience. I talked briefly about Mozilla Firefox to some semi-techy people on another topic. As soon as I said, "It blocks all pop-ups by default," the chorus came back in unison: "What's the URL?"
In moments like those I feel sure that, in the end, F/L-OSS (Free/Libre - Open Source Software; Free/Libre in contrast to Free/Gratis which would make the acronym unpronounceable and untenable to those who want to make a living with Free Software) will WIN.
I don't believe it can do anything else but win when all the facts are known.
I'm not sure why I didn't mention Thunderbird and its built-in Bayesian filter in the next breath. Maybe next time.