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Rated 5 out of 5 stars
Fantastic. Got it working fine with version 10.0 by following instructions found here (change it to 10.0): https://addons.mozilla.org/en-US/thunderbird/addon/startupmaster/reviews/329813/This review is for a previous version of the add-on (1.3.1-signed). This user has a previous review of this add-on.