Rated 5 out of 5 stars

Please, configure sizes popup and wiki's local in about:addons

This review is for a previous version of the add-on (0.6.1-signed.1-signed). 

I will look into doing this. It may take a few weeks as I am not a developer full time. I assume you mean make it settable to different Wikipedia languages when you say Wiki local. Thanks for your suggestions.

UPDATE: I just decided to try and make the changes today and it seemed to work out fine. Version 0.7 which is now being reviewed has panel resizing and any Wikipedia language.
Available in about:addons