Used to use firefox all the time, on computers, though quit using it on tablets as, at those times, it would not display in landscape, whereas other preferred browsers have always displayed landscape without any problem. Recently found that firefox now does landscape so I've tried putting it to use. While importing students' email addresses I discover it will not work, for days now, both for current firefox and firefox nightly. Working perfectly in every other browser brand, I log into same accounts in other preferred browsers, works just fine with all of them without exception. I have perused settings to find a setting causative of such gross dysfunctionality yet found nothing. Is there a remedy for that?