Rated 4 out of 5 stars

By far the best and quickiest addon ot that kind. Thank you. Maybe needs to be customizable (keys, delay etc).
For me the only serious flaw is that the frames do not close automatically and I have to manually close even the info frame with the "(looking up Wiktionary from Wiktionary.org ...)" text...

This review is for a previous version of the add-on (1.3.1). 

"Looking up" frame should always be killed whenever you move your mouse. This is a bug/glitch/whatever. Please tell what FF version/OS you are using. Please use support URLs: ether web site or email address. Please mention version of WikiLook you are using.