The addon is well written and fully functional.
I like it very much!

I'd like to ask, is it somehow possible to use it as a standalone window?
It would be handy to use it outside of regular web browsing and for other desktop applications, like Saladict.

This is a 5 star extension - until the new update totally broke it and it is 'unable to connect to Google servers' (not allowed to give the error message because it contains a URL)

[Edit - changed back to 5 stars because the dev says a fix is on the way]

Super