Recently switched to FF and have used Sprucemarks in Chrome for, however long Kai has had it out there. There was even one point where I paid for it, I think, like quite a few years ago. Hey Kai, if you catch this, is there a delay when the sorting happens after adding a new bookmark? I thought that was a setting a long time ago, trying to catch when it happens in FF. Cheers!

This add-on just works. It does its thing in the background and doesn't get in the way.