please kill the side bar, and add periodic saving in case sudden exit

Please (1) change the Save Tabs default where unless you hold down the shift key during restart Save Tabs automatically erases its saved tab list immediately upon completion of restoration of the tabs. This request is based on the concern that if the user overlooks using the shift key and then Firefox were to crash after tab restoration then the Save Tabs list, having already been automatically erased by default, could not be relied on to restore those tabs again; (2) this also brings up the general question as to whether there are any concerns with how Save Tabs will work alongside the Firefox (FF) automatic tab restoration function (or does it completely override it?). For example, after a crash & restart FF offers a one-by-one selection list of tabs to restore or not from the prior pre-crash session, will that still appear?). Otherwise this is a very good extension and I would like to increase its evaluation to 5 stars once these concerns are addressed.