Via bug 1396085 - see https://bugzilla.mozilla.org/attachment.cgi?id=8905161. In that bug, Gijs speculated the regression might be from bug 1374315.
Note that I can't reproduce this on Windows - I'll try my mac a little later.
Ryan, neither me nor Alex can reproduce this bug on a recent Nightly - can you please try again and see if you can?
I don't think this will pass muster for uplift to 57.
status-firefox56: --- → unaffected
status-firefox57: affected → wontfix
status-firefox58: --- → affected
Should we close this as incomplete? Ryan, are you still seeing this?
I haven't seen this in ages, so safe to close it I'd say.
Closing per comments. :-)
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → WORKSFORME
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