User Agent: Mozilla/5.0 (Android 6.0.1; Tablet; rv:49.0) Gecko/49.0 Firefox/49.0 Build ID: 20160916104719 Steps to reproduce: I closed the FF and when I opened it again all my private data's have not been deleted. I had to do it manually. Expected results: As I have set it, all my private data's should be deleted after FF is closed. And yes I close FF by using the exit-button.

This doesn't look like it needs to be a security bug. What Android device are you using?

Tyson can confirm this (saw it on beta), and that it used to work.

Tried this in 49 and current nightly. Both have the following behaviour, after I mark "Browsing history" for clearing on exit, and use the "Quit" button: - after re-launching, history is cleared as expected - however, all of the tabs I had open before quitting got restored My expectation would be that if browsing history is being cleared on quit, after re-launching I shouldn't see any of my old tabs. I didn't try to test for behaviour of various permutations of the clearing options, just the history one.

(In reply to :Grisha Kruglov from comment #3) > Tried this in 49 and current nightly. Both have the following behaviour, > after I mark "Browsing history" for clearing on exit, and use the "Quit" > button: > - after re-launching, history is cleared as expected > - however, all of the tabs I had open before quitting got restored > > My expectation would be that if browsing history is being cleared on quit, > after re-launching I shouldn't see any of my old tabs. > > I didn't try to test for behaviour of various permutations of the clearing > options, just the history one. Tab restore behaviour is controlled by a separate pref (Advanced -> Restore Tabs). Flipping both of these to not save history and not restore tabs seems to do the trick, although I think this is rather confusing, especially since that pref is under "Advanced". I had to look at the session restore code to figure out there is a setting for this in the first place. This behaviour would have been clearer if the "restore tabs" pref was under Privacy. Daniel, is this the behaviour you (Tyson?) have observed? Or is there something else here that I'm missing?

The behavior I am seeing is covered by bug 1266594