Yes! My pet peeve is people keep saying "no one would pay" or "it wouldn't work" but the thing is, as far as I know, it has never been tried.
For example Thunderbird is fully funded by donations.[1]
Of course Thunderbird's budget is in a different magnitude than Firefox but I'd guess the amount of users is also in a different magnitude.
[1] https://blog.thunderbird.net/2023/05/thunderbird-is-thriving...
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