+ https://github.com/arkenfox/user.js (https://news.ycombinator.com/item?id=30729021)
What you need to know about making add-ons for Thunderbird.
via https://korben.info/firefox-sous-assaut-150-extensions-piegent.html
via @celfred
via https://www.osnews.com/story/142828/mypal68-firefox-68-maintained-for-windows-xp/
