Created attachment 813080 [details] Screenshot I see a strange black triangle when playing Epic Citadel on Ubuntu 13.04 x64, FF 25b4. Video card: ATI Radeon 3000
Reproducible on FF 23.0.1
Linux specific only.
Reproducible on FF 26.0a2(2013-10-01), 27.0a1(2013-10-01), Ubuntu 13.04 x64. Strange I couldn't reproduce on another machine with Ubuntu 12.10 x86. So it's either video card or x86/x64 related. I'll dig further.
(In reply to Paul Silaghi [QA] from comment #3) > Strange I couldn't reproduce on another machine with Ubuntu 12.10 x86. That was with NVIDIA card. > So it's either video card or x86/x64 related. On another machine (Ubuntu 13.04 x86) with ATI Radeon HD 5450, FF closed unexpectedly while loading the game. So, I would say there is something wrong with webGL on ATI cards.
Paul, please try to find a more narrow regression window for this bug.
On FF <= 16, the game won't run. Starting with FF 17, this bug is reproducible. So, doesn't seem to be a regression. Trying again, I couldn't reproduce this issue on any other machine, so I guess the impact isn't that big.
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