Created attachment 8776791 [details] testcase Steps to reproduce: Open the attached testcase Expected result: See grey number 1~50 in separate small black boxes in a white page, which matches what the desktop version shows Actual result: Depending on version, it shows different things: * On Release and Beta, the background of the whole page becomes black * On Nightly, only the first 20 boxes and the last box have black background
The version of Beta here is 48.0b11. The version of Nightly here is 51.0a1 (2016-08-01).
Priority: -- → P3
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