I have a problem that when I'm opening the "Control center" on IPhone or the "Notification center" and then going back to Firefox - somehow opens new tab and I'm momentally find myself there and not on the tab, where I was before. Also if I exit Firefox somewhere to the screen but not close browser and then going back - I'm also appearing on new tab but not where I was before. I haven't closed browser, so I find this behaviour strange.