It seems that the regexp no longer matches Firefox:
C:\Users\eight04>reg QUERY HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice /v ProgId
HKEY_CURRENT_USER\Software\Microsoft\Windows\Shell\Associations\UrlAssociations\http\UserChoice
ProgId REG_SZ FirefoxURL-6F193CCC56814779
I'm using Firefox Nightly on Windows 10.
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