Rated 3 out of 5 stars

Unfortunately, Wiktionary definitions don't show most of the the time.
Wikipedia lookup works well, but the "floating window" should be moveable, and there should be a "open in new tab" button to pop out the content onto a full page.
Links within the floating window also do not function, which is a big minus for functionality.

This review is for a previous version of the add-on (1.1.3.1-signed.1-signed).