Unable to restore the last session after installing the latest version of Firefox + auto install

I still need help on the following points:

After you have installed the latest version of Firefox "restore previous Session ' is always grayed out, how to make this work?
I don't understand the solution on this site. I'm a basic user and never used another thing but windows.

How to avoid auto installation of Thunderbird and Firefox versions updates? Thunderbird installed the latest version, when I clicked "On Thunderbird" to check the latest version. I had no choice, it just started installation.

Well, I think that this is a problem when you lose history that you couldn't lose. But I hope that it was only once.

Tags: Firefox

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