Hello,

some of our Users (Windows 10) reported errors when trying to open links in Outlook messages (“Your organization’s policies are preventing us from completing this action for you. For more info, please contact your help desk”.). I have tracked down the problem to incorrect FirefoxESR Registry keys.

In these cases I noticed [HKEY_CLASSES_ROOT\.html] still points to @="FirefoxHTML", which in turn contains no HKR\FirefoxHTML\shell\open\command.

HKR\FirefoxHTML-E7CF176E110C11B does exist as well and contains correct shell\open\command entries but doesn´t get used since HKR\.html still points to HKR\FirefoxHTML.

Already tried reinstalling firefox, changing the standard app selection via Windows 10 system settings, executing [Firefoxpath]\uninstall\helper.exe" /SetAsDefaultAppGlobal command, all without success.

As a quick workaround copying the shell\open\command from the FirefoxHTML-E7CF176E110C11B entry to the FirefoxHTML one does work, but that´s not a proper fix.

Is there a tool/script, that can clean up the old stale FirefoxHTML / FirefoxURL entries automatically? It´s not just [HKEY_CLASSES_ROOT\.html], there are lots of entries all over the place still pointing to the old nomenclature.


--
Regards,
André


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