Branching out into popular fields and spending a shit load of resources (in relative terms to Mozilla size) although they're late to the party. Meanwhile neglecting the core product.
There were signs that cryptocurrencies were inherently troublesome from the very beginning, but regardless, accepting bitcoin donations in 2014-2019 isn't exactly the same as participating in the NFT craze of 2021.
[1]: Willing to switch to more environmentally friendly alternatives as long as they have the same properties as blockchain cryptocurrencies. Until then, I'll continue donating in crypto.