The biggest problem I have with Firefox on android is this problem. After reopening Firefox it commonly (but not always) forgets where I was and jumps to the top of the page (or the anchor point). I can only get back to where I was if I manage to glimpse it before it jumps and then use find in page. Seems to be fine if Firefox has closed since it was last open because several times it finds its place after that, but then I switch apps and come back soon after and it suddenly jumps. This is the main reason I gave up on Firefox last time I tried to use it, until Chrome started becoming unresponsive on pages more and more frequently.