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Re:Firefox Quantum Lands in Beta, Developer Edition by jgruen on Tuesday September 26, 2017 @10:48AM (#15339124)
hit the hamburger menu, then Customize.

In the lower right, there should be a toggle for it.

edit: not sure if that's linux friendly

Re:Firefox Quantum Lands in Beta, Developer Edition by chimen on Tuesday September 26, 2017 @11:42AM (#15339636)
Not present on Linux unfortunately.