It's become a meme, but consider WinRAR. Odds are, it's installed on your machine and you haven't paid for it. It just works. It brings up a polite nag box but it doesn't sell your data. It doesn't invade your privacy. It just works and makes enough money to keep getting updated.
It sounds hokey but, perhaps, Firefox should be trialware. Don't cut off the people who can't pay. Make a browser that just works and see how many people will pay for it even if they can use it without paying.
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