I can reproduce this on nightly, but not on devedition. Looking at the differences between the css. It seems we are no longer setting the iframe width and height, which contains the CM editor. For comparison, this is the CSS I saw that was missing: width: 100%; height: 100%; border-style: none; @miker, any chance you could look at this?
Bug 1571318 Comment 1 Edit History
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I can reproduce this on nightly, but not on devedition by opening any event bubble to view the inline source. Looking at the differences between the css. It seems we are no longer setting the iframe width and height, which contains the CM editor. For comparison, this is the CSS I saw that was missing: width: 100%; height: 100%; border-style: none; @miker, any chance you could look at this?