We're looking into this. There's a bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1624546

But we don't entirely understand why that specific DLL is being loaded.

Mike Kaply

On Thu, Oct 15, 2020 at 3:43 AM Bailey, Hazel via Enterprise <
[email protected]> wrote:

> We are currently testing the new Firefox ESR 78.3.1 and deployed to a
> small number of users. We have found for a couple of installs the user now
> gets the error message “The code execution cannot proceed because
> VCRuntime140_1.dll was not found” when loading Firefox.
>
>
>
> We tried removing the install, renaming user profiles and reinstalling but
> got the same error.
>
>
>
> We downloaded the full non ESR release of Firefox and ran the install but
> got the same error.
>
>
>
> We checked previous version installs and found that VCRuntime140.dll was
> in the install folder and this machine also had this file but it was
> looking for VCRuntime140_1.dll.
>
>
>
> To resolve the issue we had copy VCRuntime140_1.dll from
> c:\windows\systems32 to “c:\program files\Mozilla Firefox”.
>
>
>
> Kind Regards
>
>
>
> Hazel Bailey
>
>
>
>
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