How to Close All Tabs on Your Computer or Android Browsers
SelectOn startupon the left side, then selectOpen the New Tab page. SelectGeneralon the left side, then uncheck theRestore previous sessionoption. After you close and reopen Firefox to begin a new session, all of the tabs will be gone. To restore the tabs from your previous session, select thehamburger menuand chooseRestore Previous Session. Scroll to the bottom of the drop-down menu and selectGo to surfing app options. Scroll down and selectBegin fresh with start pageunderOn startup....