Firefox 52 no longer working on XP

[Dave-H]

I've had Firefox 52.9.1.6822 installed on the XP side of my machine for many years, as the last Firefox version which will run on XP.
I don't use it often now as I use a much more up-to-date version of Supermium.
However, I tried to run it today, and it won't run any more.

I just get a popup saying -

"The procedure entry point CreateThreadpoolWork could not be located in the dynamic link library KERNEL32.dll."

Anyone any idea why it would have stopped working?
I've not knowingly changed anything relevant since I last used it.
The Firefox files seem to be as they have always been, and no system files have been knowingly changed either.

[NotHereToPlayGames]

2 hours ago, Dave-H said:

Firefox 52.9.1.6822

Available here - https://archive.org/download/firefox52.9.1esr (x86 and x64, I only screencap'd x64 below)

Edited 4 hours ago by NotHereToPlayGames

[NotHereToPlayGames]

2 hours ago, Dave-H said:

I've had Firefox 52.9.1.6822 installed on the XP side of my machine for many years, as the last Firefox version which will run on XP.
I don't use it often now as I use a much more up-to-date version of Supermium.
However, I tried to run it today, and it won't run any more.

I just get a popup saying -

"The procedure entry point CreateThreadpoolWork could not be located in the dynamic link library KERNEL32.dll."

Anyone any idea why it would have stopped working?
I've not knowingly changed anything relevant since I last used it.
The Firefox files seem to be as they have always been, and no system files have been knowingly changed either.

Cannot replicate.  Firefox 52.9.1.6822 is working for me in XP+POS (32-bit) with *NO* extended kernel (not a fan of them, technically not a fan of POSReady but been using it experimentally).

This is from inside a VM.  My era-correct real-hardware for an XP+POS deployment is still undergoing experimentation.

Edited 4 hours ago by NotHereToPlayGames

[NotHereToPlayGames]

4 hours ago, Dave-H said:

and no system files have been knowingly changed either.

If I had to fathom a guess, you have used Revo to uninstall a program or two.

I used to "swear by" Revo.  Until using it to uninstall AVG/Avast (don't remember which, to be honest) forced a reformat/reinstall to get XP running properly again.

Granted, that was DECADES ago, but the bitter and sour taste is still present.  Technically, it was THAT experience that pushed me into VMs for "testing".

[Dave-H]

I do have Revo installer, if you remember I used it to give AstroSkipper a list of .NET updates in another thread.
I don't think I've ever actually used it to uninstall anything though! If I did, it would have been a very long time ago, so not related to this issue I'm sure.
I have recently uninstalled Malwarebytes 3.5.1 though, using the normal uninstallation routine in Safe Mode.
I wonder if there's any connection there?