Enable "Open previous windows and tabs" in settings and quit from the menu (Ctrl+Shift+Q) to retain open windows.

Thanks for the quick reply. I'll need more guidance. Can you tell me where to find the "settings" window I should be using to make the changes. And, where is the "menu" where I use to Ctrl+Shift+Q?

Sorry for being a little thick. Jim

You can find Quit under the File in the main menu bar and in the "3-bar" Firefox menu button drop-down.

• https://support.mozilla.org/en-US/kb/restore-menu-bar-firefox

See also "Configuring session restore":

• https://support.mozilla.org/en-US/kb/restore-previous-session