Форум поддержки Firefox для Android

I have problems logging into digital account for national newspaper app (inews.com)on my phone. I can log in fine on my PC (using identical usename & pwd.) Problem seems to be either Firefox or tinypass.com. Does this sound familiar to anyone? Any suggestions? Would be grovellingly grateful for any advice.

This is rediculous. A past post said "oh you can just chose desktop mode" but this does not work. youtube.com will consistently redirect to m.youtube.com even when I delete the m. AND have desktop mode on