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Re:Firefox Quantum Lands in Beta, Developer Edition by the_duke on Tuesday September 26, 2017 @04:42PM (#15342324)
I can confirm that the 57 beta has acceleration enabled by default on Linux.
Re:Firefox Quantum Lands in Beta, Developer Edition by jhasse on Wednesday September 27, 2017 @05:33AM (#15346154)
Are you sure? You need to check about:support, as the checkbox in the settings does nothing on Linux. It still says

HW_COMPOSITING blocked by default: Acceleration blocked by platform

for me with Nightly (57) on Linux.