It's a bug with the newer Firefox. You will have to use Chrome or hit More Options. I TRIED to fix this by upgrading the editor library, but it broke it even more
i just use a browser with more customization options that doesn't collect my data and has an active greasemonkey script community.
to be fair, greasemonkey scripts usually work in chrome too. But until Chrome has sidebar tabs, it doesn't support my needs
The reason I use Firefox is FireFTP and various other web developer extensions. I don't typically have a lot of issues with it.