I have an iMac and a MacBook Air.. Both running same version (40.0.2) of FF... and Yosemite latest... On my iMac when I quit FF I get a "Clear History Window" enabling me to confirm on exit... I like this !!! On my MacBook Air I am unable to get this "Clear History" Window on exit.. I have tried all options in the FF Privacy settings with no change.... I just cannot get the same window to activate on exit. Please can someone help with this as I would like both iMAc and MacBook Air to be the same with "Clear History" Window upon quit. Thanks allan.mcdonagh