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Re:Firefox 61.0 Released by arwineap on Tuesday June 26, 2018 @01:38PM (#17402579)
Do you need to do something through "testpilot" to get this feature?

I'm confused if this is a feature or an addon, and how testpilot relates

Re:Firefox 61.0 Released by bambamboom on Tuesday June 26, 2018 @11:44PM (#17405619)
Once you enable testpilot, you can see the experiments. I think the page opens by itself after enabling. Select page shot and click a couple of buttons on different screens.