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Re:Wraith – A screenshot comparison tool from the BBC by vidarh on Wednesday July 31, 2013 @03:23PM (#6136215)
According to the page, it supports both PhantomJs (Webkit) and SlimerJs (Firefox/Gecko)
Re:Wraith – A screenshot comparison tool from the BBC by sthulbourn on Wednesday July 31, 2013 @05:09PM (#6136859)
It does, kind of crudely though. You have to comment out a method and then comment out another.

There's a ruby refactor that allows you to just specify an environment var.