New window will not open even when "open new window in tab" is checked

I cannot open a new window even when i have the option "Open new window in tab" checked.
Firefox will NOT open a new window under any circumstances.
Also, when I quit Firefox, the system thinks that multiple instances of FF is running but they are invisible to me.

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

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