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Pinboard. They've had issues in the past, but they seem rock solid nowadays.

I've found that my web browser works perfectly fine for saving bookmarks, and these days you can even synchronize them between devices, if you choose.

I have used Pinboard in the past, and it's nice, but I'd rather just have it all in my browser.

Pocket. Well integrated into FireFox (for good or bad, thats a different discussion).

I am also trying a locally running Zotero. But not getting the hang of it yet.

I moved to Diigo when delicious died, it does alright even at the free tier (I've never had incentive to use anything but the basic/free bookmarking features). https://www.diigo.com

An org-mode file in Emacs, tagged, synced and version controlled.