Puntuado con 5 de 5 estrellas

The version of Xmarks on the Firefox Addons webiste is out of date. It sometimes freezes when you try to sync your bookmarks.

Go to http://download.xmarks.com/download and get the latest version from them. It solves the problem.

Esta valoración es de una versión anterior del complemento (4.2.1.1-signed).