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Home/ Questions/Q 82495
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Asked: May 10, 20262026-05-10T21:37:33+00:00 2026-05-10T21:37:33+00:00

Is there a command-line argument that would force firefox.exe to launch a new process

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Is there a command-line argument that would force firefox.exe to launch a new process for a particular URL regardless of whether another instance of firefox is already running?

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  1. 2026-05-10T21:37:34+00:00Added an answer on May 10, 2026 at 9:37 pm

    If you have a second profile (like ‘sidekick’), the following will launch a new Firefox process:

    firefox.exe -no-remote -p sidekick 

    However, if that profile is already used by a current Firefox session, that will not work.

    To create a new profile launch Firefox from the command line with the -P flag and create it.

    firefox.exe -P 

    The OP ykaganovich adds in the comments (in Oct. 2020, three years later):

    recent versions of Firefox (as of 2020) also have profile management UI available at about:profiles

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