Been using it since the middle of last year - and it's just about the only extension I haven't had issues with through version 1 of Firefox. A lot of other extensions had issues on the jump between FF 0.9 and 0.10 (think the naming scheme messed things up) and then to 1.0.

In additional to daily SpellBound use, I highly recommend the Bookmarks Synchronizer - https://addons.update.mozilla.org/ex...gory=Bookmarks if you've got multiple computers that you'd like to keep all the booksmarks current to.