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All recovery restore options in history tab greyed out. How can I recover previous session or open tabs?

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I woke my laptop up from sleep. I am using Microsoft 10 64 bit. Firefox auto updated, my computer restarted, I lost all of my tabs. A whole pile of them. I've always been able to restore session, or restore previously closed windows, etc, but all of those options are greyed out. I went through and cherry picked a few of the web pages I recognized out of my history, but many of my tabs have stayed open for quite some time and are not in that history. How do I recover my tabs?

I woke my laptop up from sleep. I am using Microsoft 10 64 bit. Firefox auto updated, my computer restarted, I lost all of my tabs. A whole pile of them. I've always been able to restore session, or restore previously closed windows, etc, but all of those options are greyed out. I went through and cherry picked a few of the web pages I recognized out of my history, but many of my tabs have stayed open for quite some time and are not in that history. How do I recover my tabs?
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Installed Plug-ins

  • Shockwave Flash 32.0 r0

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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0

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FredMcD
  • Top 10 Contributor
4184 solutions 58423 answers

If you clear history or use Private Browsing, then nothing would have been saved.

If the above does not apply to you, You may have corrupt sessionstore [v56] sessionstore.jsonlz4 file(s). Delete all sessionstore* files and the sessionstore-backups folder.

Type about:support<enter> in the address bar.

Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder

Linux: Under the page logo on the left side, you will see Application Basics. Under this find Profile Directory. To its right press the button Open Directory.

Locate the above file. Then rename or delete it. Restart Firefox.


Don't delete the files if you need to rescue any data from them, just move them out of the profile folder to some location where Firefox doesn't look for them. You can try to read out their contents using this tool: https://www.jeffersonscher.com/res/scrounger.html

If you clear history or use Private Browsing, then nothing would have been saved. If the above does not apply to you, You may have corrupt '''sessionstore''' [v56] '''sessionstore.jsonlz4''' file(s). Delete all '''sessionstore*''' files and the '''sessionstore-backups''' folder. Type '''about:support'''<enter> in the address bar. Under the page logo on the left side, you will see '''Application Basics. ''' Under this find '''Profile Folder. ''' To its right press the button '''Show Folder. ''' This will open your file browser to the current Firefox profile. Now '''Close Firefox. ''' Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder '''Linux: ''' Under the page logo on the left side, you will see '''Application Basics.''' Under this find '''Profile Directory. ''' To its right press the button '''Open Directory. ''' Locate the above file. Then rename or delete it. Restart Firefox. '''Don't delete the files''' if you need to rescue any data from them, just move them out of the profile folder to some location where Firefox doesn't look for them. You can try to read out their contents using this tool: https://www.jeffersonscher.com/res/scrounger.html
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Question owner

Thank you for the response. I never cleared my history and I was not working in a private window. Unfortunately, after following these instructions, the session restore, recently closed tabs, and recently closed windows options are still greyed out. I fear I have lost all of my research work. Maybe I should just turn off the auto updates on Firefox? This is a huge problem for me.

Thank you for the response. I never cleared my history and I was not working in a private window. Unfortunately, after following these instructions, the session restore, recently closed tabs, and recently closed windows options are still greyed out. I fear I have lost all of my research work. Maybe I should just turn off the auto updates on Firefox? This is a huge problem for me.
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FredMcD
  • Top 10 Contributor
4184 solutions 58423 answers

[v57+] Places Maintenance is built into Firefox.

Type about:support<enter> in the address bar.

You will find Places Database near the bottom. Press the Verify Integrity button.

When done, copy and post the results here.

[v57+] Places Maintenance is built into Firefox. Type '''about:support'''<enter> in the address bar. You will find '''Places Database''' near the bottom. Press the '''Verify Integrity''' button. When done, copy and post the results here.
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