Renaming session restore backup doesn't work, how do I restore old session after a crash?

Computer crashed and Firefox didn't remember my session. It happened a couple weeks ago so I had looked up how to fix and I learned from my mistake and saved the sessionstore.bak file before restarting Firefox. I closed Firefox, deleted sessionstore.js and renamed .bak to js but on startup it still doesn't bring up the restore session. Restore previous on the history tab still greyed out, about:sessionrestore brings up no tabs. I even tried copying that same file and also naming copies as sessionstore-1 & 2. How do I get it to work?

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