[Mozilla Enterprise] Can´t open links in Outlook - caused by stale FirefoxESR registry keys, fix?

[André Sänger]

Hello Mike,

if I understood it correctly, the FirefoxHTML-E7CF176E110C11B and 
FirefoxURL-E7CF176E110C11B nomenclature should only appear if the 
installer didn´t update a previous version that was already using the 
FirefoxHTML / FirefoxURL values. At least that´s the case on my own 
machine where FirefoxESR 68.11.0 is still using the old key without the 
"-E7CF176E110C11B" suffix.

So I suspect at some point during an update that check didn´t work as 
expected on a couple of machines, but I can´t pinpoint and reproduce the 
exact circumstances yet, which would be helpful for a proper installer 
bug report.

Right now I´m just looking for a proper fix for the affected machines, 
perhaps someone on the mailing list already had the same problem and can 
give advice?



Am 05.08.2020 um 23:35 schrieb Mike Kaply:
> If you think this is definitely a Firefox bug, could you open a bug in 
> bugzilla?
>
> I honestly don't know.
>
> https://bugzilla.mozilla.org/enter_bug.cgi?product=Firefox&component=Installer
>
> Mike
>
> On Wed, Aug 5, 2020 at 4:41 AM André Sänger 
> <andre.saenger at landkreis-coburg.de 
> <mailto:andre.saenger at landkreis-coburg.de>> wrote:
>
>     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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-- 
André Sänger
Informations- und Kommunikationstechnik

Landratsamt Coburg – Lauterer Straße 60 – 96450 Coburg
Telefon 09561 514-1205 – Telefax 09561 514-891205

andre.saenger at landkreis-coburg.de
www.landkreis-coburg.de

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