Firefox losing all my tabs if I close when a youtube video is blocked. What is accettable?

I saved several groups almost 50 pellets.
Yesterday, I was looking for some videos on Youtube. When some videos seen regularly, I select a video that seems to expect too much to appear.
I close firefox.
After the reopening, he opened with a default page and I lost all my tabs in each group.

This is the second time in a month, a disappointing situation.

If the browser opens with the Firefox home page; topic: Home, you
can press the Restore last Session at the bottom right.

You can also do Toolbar > history > restore the program.

Tags: Firefox

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