Rated 3 out of 5 stars

I tried to install latest Forecastfox version 0.9.7.5 on firefox 2.0, so a strange frame with a label appeared under status-bar. It shows:

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I tried the same extension update on Firefox 3.0 RC1 and it work perfectly... I only update this extension, so there aren't other possibility.
Someone can help me?

This review is for a previous version of the add-on (0.9.7.5).