Rated 5 out of 5 stars

unfortunately the given solution doesn't work. This is what I also did: I copied the .dic and .aff files of my dictionary to /Program Files/Mozilla/dictionaries. That did it.

This review is for a previous version of the add-on (1.3.2.1-signed.1-signed). 

Rated 1 out of 5 stars

I was looking for something that could auto-detect the language I am typing in, but this does not work.

This review is for a previous version of the add-on (1.0).