Can't restore previous session (greyed out); lost all tabs and groups

I've had a similar problem with FireFox version 30 as found in the following question: https://support.mozilla.org/en-US/questions/997956?esab=a&as=aaq
I lost all my tabs including those in two groups (maybe 100 tabs) that I'd been keeping for a couple of years and in some cases much longer. Very occasionally I'll get the "oops this is embarrassing" message from FF and when I click on the Restore Previous Session button they reappear.
What happened this time is that when booting my computer (Windows 7), Adobe Flash wanted to download an update, and instead of waiting for the boot to finish as I normally would, I clicked on the Adobe Flash Download Update button. It then opened FF and hung, so I eventually used Task Manager to end FF. After the computer finished booting, when I opened FF it had no open tabs or groups, and the Restore Previous Session option (and each of the other options in that grouping in the History menu) was greyed.
When investigating, I find I do have the sessionstore.js and sessionstore.bak files from yesterday (each about 4.5 mb), but I don't know how to access them because the Restore Previous Session option is greyed.

Awesome. And maybe back up your sessionstore.js and sessionstore.bak files somewhere outside of your Firefox settings folder in case you need them for a future recovery. (That would involve copying them back to your active profile folder while Firefox is closed so it finds them when it starts back up again.)

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    After a crash, I turned on my firefox to find the restore previous session option greyed out. So I go to my profile folder to find no sessionstore.js file, I assumed this is because the lastest firefox made changes to where the session store is stored now. Where is the session stored now and is there anyway I can restore my previous session? I really need it.

    Firefox still uses the sessionstore.js file in the profile folder.
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  • Windows XP crashed and Firefox 5.0 closed improperly. When I relaunched it, I mistakenly clicked New Session button instead of Restore previous session. How can I get that session back now? Thanks

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    I don't have a good sense of what is going wrong.
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  • V 3.6.13 - what has become of 'Restore previous session'? I've lost track of many topics in tags I had open when I had to shut down in advance of a power down by the electricity co. for day-long maintenence work in my area.

    # Question
    v 3.6.13 - what has become of 'Restore previous session'? I've lost track of many topics in tags I had open when I had to shut down in advance of a power down by the electricity co. for day-long maintenence work in my area. Being able to quickly close all tags, knowing one can recover them later is invaluable.

    See:
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  • Restore Session no longer works properly, the window shows as blank, and the restore button is greyed out. On the history tab, the three associated links are also greyed out and unusable. How do I restore functionality?

    Just as the question says, I get a restore session tab whenever I open Firefox, but it no longer shows my tabs, and the Restore button is greyed out. If I open and then close a side, it no longer shows up in the "recently closed tabs" in the History menu. "restore previous session" and "Recently closed windows" are also greyed out.
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    Make sure that you do not use Clear History to clear the <i>Browsing History</i> when you close Firefox.
    *Tools > Options > Privacy: History: [X] Clear history when Firefox closes > Settings
    *https://support.mozilla.com/kb/Clear+Recent+History
    Using the "Show my windows and tabs from last time" setting is a more reliable way to restore session data.
    * Tools > Options > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"

  • Since I updated to 18.0.1, I lost "Restore Previous Session". None of the suggested fixes brings it back.

    My computer updated to version 18.01. Now my "Restore Previous Session" option is gray. I have tried all of the suggested fixes. None of them bring it back. This is a very important option to me. How to I get it back?

    Check that session restore is enabled and working.
    *http://kb.mozillazine.org/Session_Restore
    *https://support.mozilla.org/kb/Session+Restore
    You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox Profile Folder that store session data.
    Delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox Profile Folder.
    *Help > Troubleshooting Information > Profile Directory: Open Containing Folder
    *http://kb.mozillazine.org/Profile_folder_-_Firefox
    Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).
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  • My "Restore Previous Session" button is not working anymore. When I click it, nothing happens. How can I fix this?

    When I click the "Restore Previous Session" button on my Firefox home page, nothing happens. It usually restores all of my tabs from the previous session, and now it does nothing.

    Hi cor-el
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  • Can I avoid having "Restore Previous Session" box when launching?

    After opening Firefox and then closing it normally (with the red X or using File | Exit), then the next time I open Firefox there is a blue window in the lower middle of the screen to "Restore Previous Session." What if I don't want that window there? There was no fault, no crash of any kind. I've disabled the "restore session after crash" but that didn't help.
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    Firefox 4 saves the previous session automatically, so there is no longer need for the dialog asking if you want to save the current session.<br />
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  • Can I recover my tabs and tab groups if "Restore previous session" fails? Is there a back-up option that I can retrieve them from?

    So I would like to be able to hit a "save now" button and have my current session be saved within my mozilla account. Is this possible?
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    You can look at Session Manager to have a more reliable support for restoring a session.
    *Session Manager: https://addons.mozilla.org/firefox/addon/session-manager/

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