It does what it does pretty well. It helps me when I run into a case where Firefox loses all of my pinned tabs when it crashes or has session state storage problems. But the biggest issue is that it (1) has no way to import/export the list because sometimes the addon itself loses all of its pins (!!) when the FF storage gets messed up, and (2) the editor interface is clunky and very basic which wouldn't be a big deal if I could import/export from a text file. So much potential, but it needs just a few key features to be the reliability tool we need :)