Hi Byron, could you check whether either of these are available (not hidden or grayed out): * "3-bar" menu button > History > Restore Previous Session * (menu bar) History > Restore Previous Session If they are missing or grayed, check either: * "3-bar" menu button > History > Recently Closed Windows * "Library" toolbar button > History > Recently Closed Windows * (menu bar) History > Recently Closed Windows Anything available to restore so far? ---- Could you describe any events leading up to this problem? For example, these could lead to data loss: * System crash immediately before the problem began * Firefox said it needed to create a new profile * Firefox performed a Refresh (sometimes called a tune-up) creating an Old Firefox Data folder on your system desktop