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Re:PSA: uBlock/AdBlocks on Chrome to lose function thanks to... by db48x on Saturday December 11, 2021 @12:02PM (#29522352)
Navigate to about:profiles and click “Set as Default Profile” for one of them.
Re:PSA: uBlock/AdBlocks on Chrome to lose function thanks to... by oauea on Saturday December 11, 2021 @12:21PM (#29522535)
That button grays out when both profiles are running. Try it.

Also if the firefox instance is launched with no-remote, this won't even work as expected. Instead it'll start another firefox instance with remoting enabled, which will fail to start because the profile is already in use.