They're not open for any donation, but they're suggest to donate via the electrum server you're connected to. [1]
How do I do that??
If you want to donate to Bitcoin developer, they have an address on below of the page 3E8ociqZa9mZUSwGdSmAEMAoAxBK3FNDcd [2]
ah... I actually found that donation address but I taught it's for hosting Bitcoin.org website itself.
Didn't think it goes for the development of the Bitcoin Core.
If it does I'll use that one.
ps.
found the Electrum @ThomasV address in your signature.
hardcoded in the software, so I've everything I need. THX
Bitcoin developers: https://bitcoindevlist.com/
Awesome.
Just a heads up: there's no such thing as an "official" Bitcoin website. Bitcoin.org is just the most linked and most reputable among the Bitcoin websites.
I know... It's great, decentralization and all, isn't it??