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Mac opens two windows when clicking on a link from mail application

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Does anyone know how to disable Firefox from opening two windows when clicking on a link through a mail application? If Firefox is closed, every time I click on a link through a mail application, Firefox opens the link AND a second window set to my homepage. It is so annoying. Any tips?

Does anyone know how to disable Firefox from opening two windows when clicking on a link through a mail application? If Firefox is closed, every time I click on a link through a mail application, Firefox opens the link AND a second window set to my homepage. It is so annoying. Any tips?

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See this bug report.

  • Bug 1600153 - macOS 10.15 Catalina - two firefox windows are opened when clicking on external link

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html
)