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As far as I could determine, there is no native way to open a page in a Firefox multiple profiles environment when the profile is already open. On the Linux shell I am trying something like:

firefox -browser -new-window -P "development" http://google.com

No matter which arguments I add, I don't get around the message:

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

It would be nice, if I could open a new window or even reuse a named one in a specified profile from an IDE, namely Netbeans 8.1, to debug some code.

Is there some tool, e.g. an addon, allowing me to do so?

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  • Not sure if this helps, but with -no-remote (at least on GNU/Linux) you can run instances from different profiles at the same time.
    – unor
    Commented May 28, 2016 at 4:07
  • Thanks for your hint, just tried out. It does not get around the error message when the development profile is already in use. I guess it might be intended as a security feature not to be able hitchhiking some opened window and gathering informaion by other software. I can not see any other reason, why it isn't already implemented natively for a long time. Commented May 28, 2016 at 4:22

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Just use :

firefox -P "development" http://google.com

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  • 1
    It does not work when an instance of development profile is already open. Commented May 28, 2016 at 9:50

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