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CloseReview for HTML Source Editor by ViperGeek
Rated 5 out of 5 stars
Works exceptionally well and is very lightweight. I've been using ThunderHTMLedit for years, but it doesn't seem to be supported in the latest version of Thunderbird (yet).
This review is for a previous version of the add-on (1.7).To create your own collections, you must have a Mozilla Add-ons account.