If it is only about fishing, why not use the KeePass browser plugin? That can also autofill by domain.

Yes! I’ve already found several gems

How does it compare to Xournalpp? I’ve always used that but it seems a bit antiquated.

I can also recommend Bitwarden which is a hosted password manager (enabling e.g. automatic sync). The commitment to FOSS is not as great (there have been some controversies AFAIK) but self-hosting is possible.

Sounds nice, for which services do you use it?

I’ve had mixed experiences with Invidious but haven’t tried that for some time.