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why is "about.preferences.incontent" not listed in about:config?

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the solution to to rid the options tab from loading says to modify about:config > browser.preferences.incontent to a negative, bout it's not listed

the solution to to rid the options tab from loading says to modify about:config > browser.preferences.incontent to a negative, bout it's not listed

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Hello klokm, the browser.preferences.incontent not exist any more from firefox 42 and above :(

Bug 1140495 - Remove support for windowed preferences

try the Classic Theme Restorer add-on

thank you