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You may need to combine them like "Firefox --no-remote -P myotherprofile

I don't have (nor want) another profile.

I just want Firefox to launch a new window. No matter if there already are Firefox windows active or not.

Chromium has no problem doing so. So that is the reason I use Chromium and not Firefox.

That does seem to be a quirk of Firefox profiles. You could workaround with a secondary profile that uses Firefox Sync to make them nearly equivalent.

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