Very nice, the settings are a bit hidden Rated 4 out of 5 stars

The extension works well, it would benefit from a way to access its settings from the extension manager and not only from the right-click context menu of selected text (not very intuitive).

This review is for a previous version of the add-on (2.0.rev281). 

When you select a text, right mouse click to invoke the context menu. Navigate through the Word Count Tool menu you will see the option Working with non-English text. The default is working with English text.