Generally I write email using plain text. Sometimes I really want to use HTML. I couldn’t find an easy way to switch to compose in HTML when composing a message in Thunderbird so I started searching for extensions. I found that you don’t need an extension to accomplish this. All you need to do is hold shift while clicking on the compose button (”write” button). This doesn’t work with the keyboard (ctrl-shift-m)

En parlant d'interface utilisateur ratée, un peu comme les claviers d'Apple.