Version 2.7.2 is totally buggy. Beware. Rated 1 out of 5 stars
I used to like this add-on. Until it messed up my FF. Version 2.7.2 is totally untested and shouldn't be released. It breaks such popular add-ons as Toolbar Buttons and Custom Buttons2 (at least on FF 2). After uninstalling of Foxmarks, TB are back, but CB2 are gone forever - you must install every single custom button from scratch, what could be troublesome, especially in case of bookmark buttons. So beware.
Professional developers should in such case revert ASAP to the previous version. But the authors of Foxmarks don't care. And it's even worse - they are censoring the reviews! They deleted my review in which I complained about this issue and warned other users.
As always, such deeds turn against the cheater. Now they'll have my negative review at the top. If they wouldn't delete it, it would be dug under a pile of fresh ones. And now I will check regularly if it is where it should be. Should they remove it again, I will add it back. You totally screwed this up, losers.