Show bug in Mozilla Firefox browser rendering

This test case file is to show a render bug in Firefox Browser after a
certain point in background tiled images. This has been since at least
2011.
Please FIX this bug.
See the original post issue/ticket here.
https://support.mozilla.org/en-US/questions/882572
See the 2nd post I opened years later issue/ticket here.
https://support.mozilla.org/en-US/questions/1003065