In the Options tab, select “General” from the sidebar, then locate the “Startup” section. In the menu that appears, select “Options.” (On a Mac, click “Preferences.”) In the upper-right corner of any window, click the hamburger button (three horizontal lines). Here’s how to set it up.įirst, open Firefox. If you’re tired of losing your place when you close or restart Firefox, there’s a simple remedy: Turn on “Restore previous session” in Options, and you’ll get all your previously open tabs back the next time you restart.