Cannot Upgrade from Firefox 149.0
I am running Firefox 149.0 (64-bit) on Windows 10. FF tells me that there is an update. I downloaded the update, and when I restart FF, it does not update. Version 149.0 is re-started, and Help --> About Firefox again tells me to restart to upgrade. I have tried the upgrade at least three times.
Chosen solution
I do not know if FF has been updated. The one tab that I see does not have the "help" toolbar, and I do not have time right now to determine how to get it to appear. I need my previous windows and tabs ASAP. I will look at the "Recover" URL..
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The latest version is Firefox 149.0.2. To check your version, click the Firefox menu 
button, choose "Help", then choose "About Firefox". See Find what version of Firefox you are using for details.
As I posted - About Firefox tells me that I am running "149,.0 (64-bit)". I do not know any other way of determining the FF version number.
Also try the suggestions in this article (manual update, check for updates after restarting the computer, etc.): How to fix the Update Failed error message when updating Firefox
Modified by AliceWyman
Those suggestions did NOT work. I tried re-installing, but I did not close FF before running the re-install executable. Something was installed, but there was no FF executable. I tried again, and the re-install wiped out my \Profiles\abnfpged.default directory. I have restored that directory from a backup I did last Monday, but I still cannot get FF to open with the many windows and tabs I had before the upgrade. When I start FF, I now get one tab. How do I get back to my multi-window/tab configuration?
I'm sorry about the problems you are having. Your original question was that you could not update from Firefox 149.0 to the current version 149.0.2. Is that still the case?
If Firefox has now been updated, then the original issue is solved and you may get more help if you ask a new question. See also Recover user data missing after Firefox update or reinstall, in case it helps.
You could also file a bug report in the Startup and Profile System component, or add a comment to a similar bug report. Here are some open Startup and Profile System bugs.
Modified by AliceWyman
Chosen Solution
I do not know if FF has been updated. The one tab that I see does not have the "help" toolbar, and I do not have time right now to determine how to get it to appear. I need my previous windows and tabs ASAP. I will look at the "Recover" URL..
FF was upgraded to 149.,0.2. But in the process I lost my configuration, including all of my open tabs and windows.. I need to get thesm back. See https://support.mozilla.org/en-US/questions/1576071#answer-1811588 .
I added a reply in your new question: https://support.mozilla.org/en-US/questions/1576071#answer-1811761
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