There are also browser extensions, at least on Chrome, that will let you copy open tabs as Markdown so you can paste them all in one note instead of clipping URLs into separate notes.
Those are nice ideas but they don't satisfy my needs about bookmarks.
I want to do that to avoid duplicate info between the browser and joplin.
I would like to centralize on Joplin.
Floccus could be extended for this purpose. It already supports multiple options, including saving to local filesystem. Available on Firefox / Chrome / Edge / Vivaldi
This is something I would love. I'm now using BrainTool (https://braintool.org/) which works great. It makes a single, simple org-mode file. How difficult would it be to make plugin that takes the org-file and syncs it to a notebook in Joplin?