Rated 5 out of 5 stars

2.0.2.138 works fine on FX 6.0 (Windows 7).
BTW, I'll be glad if .oxt (for LibreOffice or OoO) also has both New and Old dictionaries because the feature is really helpful.

This review is for a previous version of the add-on (2.0.1.114).  This user has a previous review of this add-on.