Hi Mladen, could you check this menu (either): * "3-bar" menu button > History > Recently Closed Windows * "Library" toolbar button > History > Recently Closed Windows * (menu bar) History > Recently Closed Windows ---- If Firefox doesn't show either Restore Previous Session or previously closed windows, possibly your history was erased. If Firefox does show a list of previously closed windows instead of restoring them, this can indicate that a hidden window is preventing a normal shutdown and restore. To hunt that down, try Firefox View. That's the button at the left end of the tab bar that looks like a file drawer. (If you removed it, you can paste '''about:firefoxview''' in the address bar and press Enter to load it.) Click "Open Tabs" in the left column to show your current windows and tabs. If there's a window listed that you can't find on screen, you can close out its tabs so this window doesn't prevent normal shutdown/restore.