Review for Firesizer by ViperGeek
Rated 5 out of 5 stars
Perfect add-on for both Firefox and Thunderbird. Just the thing for we "Type A" personalities that desire and require windows to be positioned and sized deterministically.
Works with Thunderbird 6 just fine. Simply massage the install.rdf appropriately.
To create your own collections, you must have a Mozilla Add-ons account.