I ran into some issues on Firefox Android. I wanted to clear the text box, so I marked the entire text and hit backspace. It only removes the last letter. So

I ran into some issues on Firefox Android. I wanted to clear the text box, so I marked the entire text and hit backspace. It only removes the last letter. So then I marked the entire text and pressed a letter. That successfully replaced all the text with the one letter. But then the editor broke completely. I cannot put newlines anymore, backspace is inconsistent, and the text cursor isn't shown. (The editor breaking after marking all the text and pressing a letter is reproducible.) At least on mobile the editor seems to still be unstable.