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Manually deleted cache, all sessions are gone

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Every time I try to clear the cache (cmd-shift-backspace), Firefox hangs and I have to force quit. This is a known bug (https://support.mozilla.org/en-US/questions/938139). So I tried manually deleting the cache but when I started FF again, all windows were gone, and session manager could not restore the previous session. It shows up but nothing happens when I click on it. I tried restoring everything from trash, replacing current items, but this didn't work. I had months worth of open tabs and windows that would take days to restore from history. How can I recover the lost session?

Every time I try to clear the cache (cmd-shift-backspace), Firefox hangs and I have to force quit. This is a known bug (https://support.mozilla.org/en-US/questions/938139). So I tried manually deleting the cache but when I started FF again, all windows were gone, and session manager could not restore the previous session. It shows up but nothing happens when I click on it. I tried restoring everything from trash, replacing current items, but this didn't work. I had months worth of open tabs and windows that would take days to restore from history. How can I recover the lost session?

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Hello,

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

  1. Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
  2. Under "Time range to clear", select "Everything".
  3. Now, click the arrow next to Details to toggle the Details list active.
  4. From the details list, check Cache and Cookies and uncheck everything else.
  5. Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

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Thank you.