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Tabs lost after restart and Firefox update

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Writing in some distress here. Had Firefox open with a lot of tabs, most relevantly hundreds of pages relevant for my PhD research, when my computer decided to re-start on its own. When I opened Firefox afterward I was greeted by the "What's new with Firefox" page, all my tabs gone. Both "Recently Closed Tabs" and "Recently Closed Windows" were completely empty. "Restore Previous Session" is greyed out and unclickable. After looking up solutions to this problem online I went to my profile at C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles, and discovered there was no sessionstore-backups folder there. There is a file called sessionstore.js, but it has last been modified May 2017. I checked and my history is still all there. Is there anything I can do, or do I need to go over the thousands upon thousands of entries there in search of the ones relevant for my research?

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