Провера ћириличног правописа не ради на ФФ v142.0.1, а чини ми се ни на неколико претходних већих верзија. Додатак препознаје текст на српској латиници, и ту донекле ради (премда недостају многе речи и облици), али ћирилични текст уопште не препознаје.

The dictionary works as expected, and I was pleasantly surprised when I discovered that it corrects Serbian words even when written in Latin script (i.e. not just in Cyrillic) - my advise to you would be: *advertise that fact!*
I gave it 4 stars because the number of words in this spell checking dictionary leaves something to be desired (and I probably used "Add to dictionary" feature far too often). I hope it's the work in progress.