I highly recommend homebrew game Flooder:
https://obalfour.itch.io/flooder

It doesn’t really work for me. I don’t use (or know how to use some of) the services that it requires

I’m gonna try this one out, though it seems complicated

I don’t use Firefox exclusively

Yeah I guess I could use KeePass for this, but it seems like it might be tedious.

My reasons for asking: I don’t want to pay for a service, I don’t want to rely a service that could shutdown (I used to use del.icio.us once upon a time), and I do want something that syncs

I’m currently using Shaarli on a cheap host, but they’re about to raise their prices drastically. Also, I’m not very tech savvy so I haven’t been able to update is since I started using it, so I kind of don’t want to deal with it anymore away.

I just checked out Floccus but I’m not sure it’ll work for me because it requires a server or additional service.

I use Kavita and I’m really happy with it. I understand your reservations about the subscription, but I’m not subscribed to the premium features because I don’t need them either.

The PDF reader on it is okay, I think. I really prefer reading PDF files. I usually convert my PDF comics to cbz. But yeah, I like Kavita because it’s easy and convenient.