https://thunderbird.topicbox.com/groups/planning/Tb418f4ccd58dbb80-M25eb2d2ddee4b0921d37e122/thunderbird-a-born-again-crustacean https://thunderbird.topicbox.co

https://thunderbird.topicbox.com/groups/planning/Tb418f4ccd58dbb80-M25eb2d2ddee4b0921d37e122/thunderbird-a-born-again-crustacean https://thunderbird.topicbox.com/groups/planning/Tb418f4ccd5... They explain it here, but it is basically not needed though they wanted to take advantage of rusts features.