David, the QA testing looks good and we agreed with Harald that this feature can be enabled on Nightly by default! Can you please look at this, thanks! Here is the pref https://searchfox.org/mozilla-central/rev/8a63fc190b39ed6951abb4aef4a56487a43962bc/browser/app/profile/firefox.js#2133 Honza
Bug 1580544 Comment 1 Edit History
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David, the QA testing looks good and we agreed with Harald that this feature can be enabled on Nightly and DevEdition by default! Can you please look at this, thanks! Here is the pref https://searchfox.org/mozilla-central/rev/8a63fc190b39ed6951abb4aef4a56487a43962bc/browser/app/profile/firefox.js#2133 Honza