I use tab groups actively and would save much of my work in my ever-growing list of tab groups. I saw today that many of them had disappeared. I wasn't signed into Firefox and nor do I have any different profiles made. I see two tab groups that I made yesterday but none from before that. How could this happen? How do I recover so much of the work I had saved up?

I am on an M1 Macbook Air using the most uptodate Firefox 146.0.1.

Not only are all my tab groups gone, the open tabs have been removed from my history! I had PhD research pages open and can only recover a few of them. This is devastating! Why was the history also affected?