@
dieketzer @doublespaces There has been no recent change related to Twitter in the add-on. My guess is that it's an issue with the browser, or perhaps a server misconfiguration. Twitter embeds work fine for me on any browser but Firefox on Windows and OSX may have some difficulties. I don't know why and I have no way to reproduce it. It works fine on Firefox 44/Windows 10. If you look inside your browser's error console, there may be an error message.
You may also try loading the tweet in a separate tab, see if that works differently:
https://s9e.github.io/iframe/twitter.min.html#710881562846306304