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We used to be able to block mailto: window on firefox from poping up when someone clicked on a mailing address, but upgraded to windows 10 and on some pdf files if we click on an email address add an email account pops up. How can we permanently disable firefox from doing this running on windows 10. Thank you in advance

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1 Answer 1

Reset to default
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Try following inside of Firefox:

  • via address bar, use: about:config
  • search for: network.protocol-handler.external.mailto
  • change value to: false
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  • We have that, it does not work. Firefox version is 45.0.1
    – kevbuntu
    May 4, 2016 at 19:17
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    It does work on firefox version 55.0.3
    – user495338
    Nov 7, 2018 at 15:40
  • Works in 78.14.0esr (64-bit)
    – Johnny Bigoode
    Sep 28, 2021 at 15:03

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