Currently, when you update Firefox, it updates the application, but it does not update the version no. packaged with it.
For example, if I run `winget upgrade` in Windows (WinGet is the Windows Package Manager), It will show the following output:
And it does so even if Firefox is running the latest version.
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Please, take a look at the following bug report: Bug 1780135 - Windows Installer incorrect version number
It seems to be similar to what you are requesting.