Rated 4 out of 5 stars

Από τον/την hindsight στις Δεκ. 3, 2016 · μόνιμος σύνδεσμος

I needed this addon in order to categorize my mail accounts (i.e private, companyA, companyB). I don't know if there might be another way to do this, but with this add-on it works.
The only thing which is missing is that there are no names displayed (anymore?) for the categories in Folder View. And maybe it would be nice to sort categories individually...