Using Firefox 66.0.2 on Android as well. Pretty much the same behavior here, except that it does not look random at all: - at the top of the page, if I scrol

Using Firefox 66.0.2 on Android as well. Pretty much the same behavior here, except that it does not look random at all: - at the top of the page, if I scroll, the address bar disappears; - as soon as the fake HSBC bar appears, the real address bar comes back; - both of them remain here until I reload the page. It looks like if the use of CSS position: fixed forced the Firefox address bar to be visible. Which given the context looks like a really good thing!