Close tab groups actually closes tabs rather than just the grouping. How do I recover all tabs, not just the last 10? Pages and tabs are not in recent history.
I had a problem with tab groups - if I mistakenly close tab groups, I can only recover the last 10 tabs.
I had a window with many more than 10 tabs which I reopened each session by going to History > Recently Closed Windows. I knew this was risky - I could lose this if I did not keep it in an open window or recently closed window. So I was looking for a way to save this window with all the tabs. I looked into tab groups and, not knowing what I was doing, I closed the groups of tabs. There seems to be no recovery for other than the last 10 tabs. And open tabs are not necessarily in recent history if I have not accessed the tab and refreshed.
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I don't use tab groups myself, but I know of a way to increase the number of closed tabs that Firefox remembers. Unfortunately, it's not retroactive...
(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.
(2) In the search box above the list, type or paste sess and pause while the list is filtered
(3) Double-click the following preferences and enter the preferred new value:
(A) browser.sessionstore.max_tabs_undo (default: 10)
(B) browser.sessionstore.max_windows_undo (default: 3)
Regarding what is in history, by default, Firefox will load tabs on demand when you restore a session, rather than loading every single tab immediately. If you turned off that setting, or if you visited all the tabs, then those pages should be in history, but finding them amidst all the others would be quite a challenge...