Diễn đàn hỗ trợ Firefox dành cho Android

Home screen might be considered a specialized bookmark I suppose but the categories don't directly apply above. Browsers for decades have allowed a custom Url to be entered or "use current page" as home screen. I can find no option under firefox settings for Android enter it. What's the trick?

I picked last tab but that isn't the same as a fixed URL such as my bank website or Facebook page I would always want to see first.