I don't expect you do to anything with it. If you want to investigate, go right ahead, it's easy to reproduce and debug to your heart's content. That image is already gone from my panda (sorry, I had other things to test) but I'm sure the bug itself is not. It could be a bug in the compiler, in the video codec code or in firefox on arm. I'm not here to determine which.
I don't expect you do to anything with it. If you want to investigate, go right ahead, it's easy to reproduce and debug to your heart's content. That image is already gone from my panda (sorry, I had other things to test) but I'm sure the bug itself is not. It could be a bug in the compiler, in the video codec code or in firefox on arm. I'm not here to determine which.