I've been having this strange behaviour in Firefox Nightly on Android, where the "Delete browsing data on Quit" setting, whether it is ticked or not, automatically closes open tabs. This used to not be a thing, and I wish for some clarification if this was supposed to do this from the start or not. My settings under the "Delete browsing data on quit", which is of course turned on: '''Ticked''': Browsing data, Cached images and files, Downloads '''Unticked''': Open tabs, Cookies and site data, Site permissions Tabs get closed, otherwise works as on tin.