I'm running Android 4.1.1 Firefox for Android v22 Acer Iconia tablet. so when I follow the instructions to go to Settings and delete all the private data I expect all history and cache to be deleted except. After I get the "private data deleted" confirmation if I open a new tab all the history is still there. This is an undesirable 'feature' The sync with other devices is manual - I do it every week or so it's not much use to me before I uninstall and use a different browser as my default, what's stopping the browser from behaving as I expect it to.