Hi Brian, you can see how to re-open your closed tabs here: https://support.mozilla.org/en-US/kb/how-do-i-restore-my-tabs-last-time

I asked how to re-open closed Tab GROUPS!

1. '''Create a tab group'''. You will then have the option to name the group and choose a color. 2. '''Name the group'''. You will see that name to the left of the group. 3. '''Right-click on the name''' and choose '''Save and close group'''. This will save and close the group, allowing you to '''re-open''' it from the 'List all tabs' icon on the tab bar. More info [https://support.mozilla.org/en-US/kb/tab-groups#:~:text=Manage%20a%20tab%20group,-Right Manage a tab group]