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Multiprocess windows suddenly disabled on Developer edition, enabled on regular edition.

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Have refreshed and disabled all add ons. Still doesn't work if I set "browser.tabs.remote.autostart" to true. Version 54.0b14 (64-bit) on OS X 10.11. I only found out about it as all of a sudden the responsive design mode changed to a really cut-down version.

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hi, does it give a reason why multiprocess mode is disabled in about:support? you could also turn e10s on yourself with browser.tabs.remote.autostart.2...

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It said something about add-ons which was why I disabled them. However, this is embarrassing – it's all started working fine again…