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Every time I open outlook.office.com in my browser on Windows 10, I get the message: enter image description here

I have to close that manually every time. How can I turn that message off permanently?

And no, I don't want outlook.office.com to be my application for mailto links.

I am using Firefox 89.0.2 (64-bit).

NZD
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    IIRC Firefox does not offer an option to permanently decline. – Daniel B Jul 18 '21 at 19:38
  • https://support.mozilla.org/en-US/kb/change-program-used-open-email-links does this answer your question ? – 1NN Jul 18 '21 at 19:42
  • Ah yes: https://bugzilla.mozilla.org/show_bug.cgi?id=668577 // I think it's possible to disable protocol handlers altogether. Is that acceptable for you? – Daniel B Jul 18 '21 at 19:47
  • @1NN I don't want to set or change an email client, I just want to get rid of this pop-up. – NZD Jul 18 '21 at 21:09
  • @DanielB I tried the UserChrome.css solution, but it didn't work. According to the description it works on ff 28 and 31; I'm using ff 89. – NZD Jul 18 '21 at 21:30

1 Answers1

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The comments in https://superuser.com/a/370235/478867 read:

This recently just happened to me, after over 15 years of using it. Changing network.protocol-handler.external.mailto to false seems to have worked for me. – Asinine Sep 21 '20 at 21:12

This did the trick for outlook365 and FF 89. – Alfabravo Jul 7 at 14:01

I am using ff 89 and when I changed network.protocol-handler.external.mailto to false in about:config, the pop-up doesn't come up anymore when I refresh the page.

Mokubai
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NZD
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