When I add search engine in firefox for android, it show this. But I can add correctly on firefox for computer. By the way,this afternoon,I am very angry. Because when I want to send feedback ，I'm in a loop that 'ask now-get help-choose products-ask now'. I find if I use orginal lanuages , I can't get help relly, I can only read articles! Whatever, it spends me more than 1 hour to look for the way to send feedback，it greatly consumed my enthusiasm for this product.