Firefox no longer asks to save tabs and windows when you close it. This article explains how to get your tabs and windows back from the previous browsing session.

Note: In order to get your tabs and windows back from the previous session, you should close Firefox from the menu: At the top of the Firefox window, click on the Firefox button (File menu in Windows XP) and then click Exit If you close each window or tab, only the final window or tab that you closed will be available when you restart Firefox.

Download Firefox (newest version)

Restore the previous session from the default home page

If you had tabs and windows open when you closed Firefox, the default Firefox home page will have a Restore Previous Session button on it. To get your tabs and windows back, just click it.

Note: If you’ve set your home page to something other than the default Firefox home page, you can restore the default home page.

Restore the previous session from the history menu

Here’s how to get your tabs and windows from a previous session back if you don’t use the default Firefox home page:

At the top of the Firefox window, click the Firefox button, go over to History (click the History menu on Windows XP) and select Restore Previous Session.

Restore the previous session every time you open Firefox

See Configuring session restore for instructions on setting Firefox to always show your windows and tabs from last time when you start it.

Via Mozilla