Question page cannot show up
There is a problem that has never been solved for me, every time I log in my duolingo account on firefox and turn in to every lesson practice, it cannot show the question part. I sincerely ask anyone could help solve this baffling.
But other browsers work?
What do you mean by "cannot show the question part"? Can you give more information?
If Firefox doesn't work but another browser does (like Chrome, IE, or Safari), then something is different in Firefox. Look at your extensions and your plugin settings. This is a good starting place.