Works Great Rated 5 out of 5 stars
Good: Works perfectly with FF v7.0.1. Nice animated radar map. Decent customization. Plenty of weather icons.
Not so good: 'Display location name on toolbar' sort of does not work - have to play little bit more; no choice for different weather sources: accuweather.com might be accurate for USA but not for Canada, Europe...
I am diehard user of Weather Watcher so after further comparison will provide additional feedback.