Hello everyone. That's an awesome extension ! But I've encounter two little problems with it.
The first is about information bubble in firefox (i already talked about it in Github, didn't saw this page).
When you apply H1, H2, H3 to a selected text, the associated tooltip stays "stuck" when it reappears the next time you want to apply another one. It makes that soon, the first ones (H1, H2...) are not accessible anymore, as seen here :
The problem is not present on chrome.
The second one is about spaces between paragraphs. If i want to insert an empty line in this message, I just have to fill a line with two spaces, and it will make an empty line in the final messages. It works too with this extension, but if I edit my message afterwards, those empty lines will have disappeared (and same thing each time I edit).