I'm sorry to hear about this problem. Do you get any tabs back if you try:

• "3-bar" menu button > Restore Previous Session
• (menu bar) History > Restore Previous Session

If that is grayed or missing, can you undo any closed windows using either:

• "3-bar" menu button > Library > History > Recently Closed Windows
• (menu bar) History > Recently Closed Windows

Let's look for your data:

Did your Firefox perform a Refresh?

If Firefox mentions a "tune-up" or fixing a slow startup, it suggests this feature. When it runs, your entire old profile folder containing all your Firefox data is moved to your Windows desktop inside a folder named Old Firefox Data. If you see a folder with that name, please click inside and see how up-to-date its contents are.

If you do not have that folder:

Does the Profile Manager list additional profile folders?

To check on that, inside Firefox, type or paste about:profiles in the address bar and press Enter/Return to load it.

This page should list all the profiles Firefox is currently aware of. If you see a profile that is not currently set as default that looks promising, scroll down to it and click the Set as default profile button below that profile, then scroll back up and click the Restart normally button. (There are some other buttons, but I think those are still "under construction" so please ignore them.)

Firefox should exit and then start up using the other profile. Does that one have any recent data?

After checking any additional profile folders, please use the about:profiles page to switch back to your regular profile.

If the Profile Manager didn't help:

Do you have any unlisted profiles?

Here's how to check whether there are additional profile folders in the standard location in addition to the one you're using. Select and copy the following shortcut path:

%APPDATA%\Mozilla\Firefox\Profiles

Paste that into the Windows 10 system search box or into the Run dialog (Windows key + R will call that up) and press Enter to load it. That should expanded to this hidden path:

C:\Users\username\AppData\Roaming\Mozilla\Firefox\Profiles

Here you will find one or more folders, each of which is a separate Firefox profile folder. Your currently active profile folder should have very fresh time stamps on the file. Are there any other folders here that might have data from recent days?

If you've got any promising looking folders, we can discuss next steps to recover use of them.

Were you able to find any Firefox data folders that might have your files from before the update?

That's odd, my reply isn't here. I worked in IT for many years so tried some things before venting here. I was too aggravated at the time to post all my step.

Restore Previous Session was greyed out. There is only one profile.

FF did a full update, not a refresh. My menu and bookmarks toolbars were gone as were my pinned and unpinned tabs and all my add-ons.

Luckily I had just synced FF a few days before so I was able to get those items back, however the tabs I had saved in the One Tab add on are completely gone.

The Firefox data folder on my computer did not have any of the One Tab links/tabs.

After doing research, and following the One Tab suggestions, these missing links are not retrievable. I am out of luck and it would be impossible for me to remember all the links/tab I had listed over all the time I used One Tab not to mention the hundreds of hours it would take to even try.

FF let me down again because they didn't tell me an update was pending otherwise I could have taken steps to prevent this from occurring.

FF has done this to me multiple times in the 10+ years I've used it as my main browser. I've had enough. I turned off auto-updates and should have done this a long time ago. Going forward, only update when I'm ready. And, when I'm ready I will sync/export/take snapshots of things so they can be found and put back exactly where they belong before the update. It's very sad I have to go to such extremes just for an update.

I am now in the process of researching other browsers because I won't go through this anymore.

I thank you for your time.

If it would still be useful to have your OneTab data back, this was going to be my next suggestion.

When Windows updates, it often captures a snapshot of Firefox data. Accordingly, there may be a shadow copy of your profile folder in a restore point. To avoid massive data damage, do not use system restore. Instead, you can go mining for files this way:

(1) Set Windows to show hidden files and folders:

https://support.microsoft.com/en-us/help/14201/windows-show-hidden-files

(2) Download and run one of these programs:

• ShadowExplorer: http://www.shadowexplorer.com/
• System Restore Explorer: http://nicbedford.co.uk/software/systemrestoreexplorer/

Within the most recent restore point shown in the program, you can explore along this path to see whether you can find a timely shadow copy of your profile:

\Users\your-user-name\AppData\Roaming\Mozilla\Firefox\Profiles\

(3) Within your profile folder, double-click into browser-extension-data and... here's the tricky part. The folder names often are meaningless GUIDs. The one you want to find hopefully is named extension@one-tab.com -- double-click into that one and export the storage.js file. If possible, rename it storage-20181021.json (or whatever is the relevant date) so that if you export multiple files, you can keep them distinct.

(4) Use this tool on my website to extract out a page of clickable links:

https://www.jeffersonscher.com/ffu/scrounger.html

A page of links is the best I can do; I don't know how to convert it to Firefox session data.

Possibly there is a way to import it into OneTab assuming you are running it again now. I haven't researched that.

For future reference: Back up and restore information in Firefox profiles

Show hidden files and folders already in effect. Downloaded Shadowexplorer - extension@one-tab.com does not exist. Only GUIDs. Please see image.

However, I was able to locate the extension@one-tab.com folder here: search-ms:displayname=Search%20Results%20in%20Firefox&crumb=location:C%3A%5CHarddiskVolumeShadowCopy2%5CUsers%5CCadwellM%5CAppData%5CRoaming%5CMozilla%5CFirefox\extension@one-tab.com

I used your Session History Scrounger and my links ARE THERE!

You, sir, are a genius and I have no way to repay you!

Thank you to the nth degree!!!!!!