[Affected versions]: - latest Developer Edition 51.0a2 - latest Nightly 52.0a1 [Affected platforms]: - Ubuntu 16.04 32bit/64bit [Steps to reproduce]: 1. Start Firefox 2. Visit demo https://www.ibiblio.org/e-notes/webgl/gpu/bounce.htm 3. Click the Next button [Expected result]: - A 20x20px size square is displayed. [Actual result]: - 1x1 px size square is displayed. [Regression range]: - This is not a regression, it reproduces back to when webgl2 was enabled by default in Nightly (2016-04-25) [Additional notes]: - Here are two videos showing the behavior on Ubuntu and Windows: Ubuntu: https://dl.dropboxusercontent.com/u/109148197/webgl2%20square%20size.mp4 Windows: https://dl.dropboxusercontent.com/u/109148197/webgl2%20square%20size%202.gif I did not uploaded them directly here because of the format used by the video from Ubuntu, sometimes it does not play for everyone (ran into this in the past).
So after more investigation, this is also reproducible on Mac OS X 10.11.6 and Mac OS X 10.12.1 using latest Developer Edition 51.0a2 but not on latest Nightly 52.0a1. Both Fx versions are affected on Ubuntu though.