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You asked, we built it: Firefox tab groups are here | The Mozilla Blog
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Except right now you lose all of your open tabs if you close the browser with the "X" on pc or if you shut the computer down.
To make it save your open tabs right now, you have to click the ... and then select "exit".
Can't you restore them with Ctrl + shift + T or maybe Ctrl + shift + N ?
When I click history in the menu after reopening firefox, I have an option to restore previous session.
I've clicked history to get some pages back, but haven't noticed a restore previous session option. Great if it's there, but still a large bug that's been present for quite a while.