Features in the Firefox version of the add-on are lacking in comparison to the Chrome version. For instance, I cannot right-click on a page (or use the icon in the toolbar at the top) to copy my password so that I can paste it into a field that Lastpass cannot otherwise manage to auto-fill. Instead, I have to go into my vault and copy my password from there.

LastPass as a service is definitely 5 stars, the Firefox addon-- 3 stars as it currently stands.