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Rated 5 out of 5 stars
Never mind, it suddenly started working in T-bird again... might have been a problem with another extension.This review is for a previous version of the add-on (1.3.20110715.1-signed). This user has a previous review of this add-on.
Cool, thanks for the update.
I got around to trying it with Thunderbird 5 (both Linux & Windows) and had no problems, so I was confused by your initial report.
Glad it's resolved itself!