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Why is Firefox opening a new window instead of a tab from an external link?

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MTUser
MTUser
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When I open a new link from an external source (Thunderbird) this is what always happens: 1. Firefox 72.0.2 (64-bit) is already running: I get a new tab in the current open window just as I have set it - great! 2. Firefox is not already running: It launches and I get a first window with the home page and a SECOND window with the link - HATE!

I want example 2 to behave like example 1.

I have the correct tab settings in preferences I have played with the settings in about:config (browser.link.open_newwindow, etc, etc) and I cannot change this behavior.

I am running Mac OS Catalina version 10.15.3 (19D76) (latest).

When I open a new link from an external source (Thunderbird) this is what always happens: 1. Firefox 72.0.2 (64-bit) is already running: I get a new tab in the current open window just as I have set it - great! 2. Firefox is not already running: It launches and I get a first window with the home page and a SECOND window with the link - HATE! I want example 2 to behave like example 1. I have the correct tab settings in preferences I have played with the settings in about:config (browser.link.open_newwindow, etc, etc) and I cannot change this behavior. I am running Mac OS Catalina version 10.15.3 (19D76) (latest).