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Re:Firefox May Have Lost Up to 12% of Its Users So Far in 2021 by dmitrygr on Wednesday July 21, 2021 @08:04PM (#27913722)
They are on record that it will be removed "real soon now". Apparently "nobody uses it"
Re:Firefox May Have Lost Up to 12% of Its Users So Far in 2021 by _Microft on Thursday July 22, 2021 @02:44AM (#27916149)
I did some searching and they seem to keep the about:config option:

https://bugzilla.mozilla.org/show_bug.cgi?id=1703254