I feel kind of dumb, and this is probably user error, but when I press the play macro button, absolutely nothing happens. I’ve tried recording various different simple macros on different forms/websites using both the firefox and chrome extension, both have the same issue. I tested on MAC OS Catalina and a Windows 10 VM.
Wow! I just figured it out. The macro has to be selected in the left column even though nothing is selected when you record and save. It should auto-select after it forces you to save the macro.