Since I have no interest in the “save the website page” feature, only bookmark management, I decided on Raindrop.io.
I think it actually will be an improvement on Read It Later, oops, sorry, I mean Pocket. It has full-function extensions for all my browsers, 2FA security, mobile apps, desktop apps (not that you need them), and a web app. You can set the browser extension to just add or remove a bookmark, or you can have it be a mini-collection browser like the In My Pocket extension.
The only thing I haven’t figured out is if it has an archive like Pocket does. Sometimes I mark a saved site as read, but then want to get it back later.