This is set in the same place you would set your home page. orange Firefox button ''or'' classic Tools menu > Options > General Select among the options for "When Firefox starts" Please note that occasionally something goes wrong and your saved session is lost. People who have reported this here (in very angry posts!) often refer to an update, either of Firefox or a third party application that uses the browser. To help protect against session loss, consider making regular backups of your active settings folder (Firefox profile folder) and also making use of the feature to Bookmark tabs. * [[Backing up your information]]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.) * https://support.mozilla.org/en-US/kb/use-bookmarks-to-save-and-organize-websites#w_how-do-i-bookmark-all-of-my-open-tabs

Thank you!