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Previous session was not saved - how to get it back?

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A common thing I've done is leave 20+ tabs open throughout the time I use FireFox, then close and leave them there. Every time I open FireFox, it has worked fine. Just now, I opened FireFox literally a few seconds after closing it and my session didn't restore. Some of these tabs have been there for MONTHS, there's no way of rooting through my history to find them. How do I get my session back?

Edit: Fortunately, I got my previous session back. Why would it not restore? I did nothing differently.

A common thing I've done is leave 20+ tabs open throughout the time I use FireFox, then close and leave them there. Every time I open FireFox, it has worked fine. Just now, I opened FireFox literally a few seconds after closing it and my session didn't restore. Some of these tabs have been there for MONTHS, there's no way of rooting through my history to find them. How do I get my session back? Edit: Fortunately, I got my previous session back. Why would it not restore? I did nothing differently.

Modified by All Seeing Eyes

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Hello, check if your firefox is up-to-date by going to Menu>help>about firefox. update it if its not.

for your problem visit this ease fix page https://support.mozilla.org/en-US/kb/restore-previous-session

and also try the following:

   Open the about:config page on Firefox
   Find browser.sessionstore.restore_on_demand
   Change the value of this string to true 

Please report back soon.