This is with the highlight checkerboarding pref on. This only happens to Ehsan. It might have to do with external monitors.
Specifically I think I have seen this after testing bug 1203820 this morning.
I've backed out a buggy change from bug 1191539, that'll probably fix this.
Optimistically duping based on what Markus said (the backout was done in bug 1205863), please reopen if you still see this in tomorrow's nightly or latest central.
Status: NEW → RESOLVED
Closed: 4 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1205863
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