How do I restore a previous session when the Firefox homepage does NOT have the "restore" button and it is grayed out in the menu? menu

My Firefox homepage had a "Restore Previous Session" button but it has disappeared. SO when my Firefox crashes I lose all my tabs and tab groups, and this is very inconvenient. I have checked through all the "Options" seeing if there is some button there to enable this feature, but to no avail. I am frustrated as after a crash I spend hours revisiting all my links in my History menu to reset my tabs. Can you help?

In case you are using "Clear history when Firefox closes":
*do not clear the Browsing History
*Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
*https://support.mozilla.org/kb/Clear+Recent+History
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.
Clearing cookies will remove all specified (selected) cookies including cookies that have an allow exception and cookies from plugins.

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