Hello Wisdown, I am sorry to hear that you are experiencing issues with the ''Restore Previous Session'' tool and would like to recommend you troubleshooting the problem with the help of the following [[https://support.mozilla.org/en-US/kb/Session-Restore?s=restore+previous+session&r=1&e=es&as=s#w_when-youve-set-firefox-to-show-your-windows-and-tabs-from-last-time|support article]]. Also see: [[https://support.mozilla.org/en-US/kb/add-a-device-to-firefox-sync add a device to firefox sync]] and [[https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync setup firefox sync]] Thank you for your valuable time and great patience and pleast let me know how it works out. If you found this answer helpful, please mark it as solution so that I can raise my level of helpfulness. Surf safe and have a great day!