Outlook won't open links in Firefox when FF closed

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Thane K. Sherrington

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Jan 6, 2026, 11:07:46 AMJan 6
to enter...@mozilla.org
Here's an odd one, and I'm wondering if anyone has a fix.

I have a client with MS365 Outlook (latest updates) and latest FF.  If Firefox is closed, when he clicks on a link in an email, it turns blue, but nothing opens.  But if I open FF first, then links open as one would expect.
If I switch Outlook links from default browser to Edge, it works fine (thank you MS).

Any ideas?

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Thane K. Sherrington

Computer Connection, Ltd. ...taking the mystery out of computers since 1982.
Winner of the 2012 Ian Spencer - Excellence in Business Award
Thanks for making us the Reader's Choice Best Computer Store in 2016, 2017, 2018 and 2019!
95 College St.
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th...@computerconnectionltd.com

Mike Kaply

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Jan 6, 2026, 2:47:42 PMJan 6
to Thane K. Sherrington, enter...@mozilla.org
That's a new one. I assume the outlook app allows you to select Firefox explicitly for email?

This is probably worth opening a bugzilla bug

Mike

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Thane K. Sherrington

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Jan 6, 2026, 3:20:49 PMJan 6
to enter...@mozilla.org
No, the only options are "Default Browser" or "Edge" (Microsoft needs to be broken up by anti-trust so badly).

I'll open a bugzilla bug.


Thane K. Sherrington

Computer Connection, Ltd. ...taking the mystery out of computers since 1982.
Winner of the 2012 Ian Spencer - Excellence in Business Award
Thanks for making us the Reader's Choice Best Computer Store in 2016, 2017, 2018 and 2019!
95 College St.
Antigonish, NS
B2G 1X6
902-863-3361 (phone)
th...@computerconnectionltd.com

Mike Kaply

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Jan 8, 2026, 9:18:50 AMJan 8
to Thane K. Sherrington, enter...@mozilla.org
We had someone look into this in detail and they aren't seeing this on their machine with outlook

We're curious. If you click the windows button and just type a URL with Firefox closed, does it open?

Want to verify this isn't an outlook specific issue.

Mike

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