My Tabs and Grouped Tabs were lost following reboot and not restored via History.

I closed Firefox properly and rebooted my computer. When I restarted Firefox, instead of seeing the tabs from the previous session, a window with the message that Video DownloadHelper (add on) Update 4.9.6 had been applied, and the other tabs in the open window were what appear to be my default set stored as my Home Page. All of the previous tabs and the grouped tabs that I was using (and would very much like to have back) were gone. I tried to use History>Restore Previous Session, but it was grayed out so I thought to look again and try History>Recently Closed Windows, but there was nothing available to restore either.

Step 1 would be to salvage your sessionstore files and make backup copies before exiting Firefox or making any other changes.
Open your active Firefox profile folder (personal settings folder) using
Help > Troubleshooting Information > "Show Folder" button
Copy all files that start with sessionstore to a safe location such as your documents folder.
If you have not exited Firefox since this happened, try the History menu to re-open closed windows ("Previously closed windows") and within each window, to re-open closed tabs ("Previously closed tabs"). Can you get them back??
Unfortunately, by default, Firefox only stores 10 "Previously closed tabs" per window and 3 "Previously closed windows." You can find these lists on the History menu. This might be enough for most occasions, but you can increase the number stored.
(1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) In the search box above the list, type or paste '''sess''' and pause while the list is filtered
(3) Double-click the '''browser.sessionstore.max_windows_undo''' preference and enter your preferred number of windows (I have 10).
(4) Double-click the '''browser.sessionstore.max_tabs_undo''' preference and enter your preferred number of tabs (I have 20).
If you exited Firefox after the tabs were closed, does the sessionstore.bak file have a promising date/time stamp around that time? If you have exited and restarted Firefox multiple times, it's probably no longer possible to recover the old session data. To keep numerous sessions, you need an extension like Session Manager or Tab Mix Plus.

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