Just use v9.0.1 and the add-on works again as it should. The dictionaries are included, that why it's about 15MB. Or we could simply edit the xpi (which is a ZIP) to fix the latest version. ;)

I rarely need a grammar checker these days, but I have found almost all of the suggestions I get in "picky" mode — particularly when I am writing something a bit more formal than a text — very reasonable. The fact that I probably "only" use about 10-20% of them should be taken in the context that I have used other grammar/spell checkers and rarely take their suggestions at all!

Исправляет ошибки. Мне, грамотею ещё какому, помогает писать грамотней.

I have to do a lot of reports via web page for client installations and having a spell and grammar check option that catches style suggestions, such as em dash usage, makes life very easy. Great extension!!

Devient vite indispensable ! Sérieuse aide pour rédiger des textes sans trop se poser de question sur certaines terminaisons. Vraiment super !