Review for Markdown Here Revival by Don Reba
Rated 5 out of 5 stars
Happy to again be able to use Markdown Here after updating Thunderbird. The formatted email styling for Revival does not look nearly as good, but I remedied this by going to the old project's Github page, copying its style sheet, and pasting it into Revival's "Primary Styling CSS" in options.
To create your own collections, you must have a Mozilla Add-ons account.