A picture is worth a thousand words... Under Firefox 56, OpenGL worked great. Firefox 57 is buggy with openGL and does not seem to consistently finish loading images. Sometimes the image is black, sometimes gray and sometimes it is incompletely loaded. I've enclosed a few screenshots from this page: https://pannellum.org/documentation/examples/tour/ showing the inconsistent results. Also... this page won't let me upload the screenshots so I've placed them: https://app.box.com/s/ghft6xz52zbs4i9178qbyfpcoojjp8kd https://app.box.com/s/lh6aeph5pvgwtj5yzqajx18uk9io6y05 https://app.box.com/s/btud2q9sx0vwb5jmsv1q7wtzbtu8ifu0 https://app.box.com/s/gr8zabrkaviy03t2mbo31c5qkrqi37e0 https://app.box.com/s/um5cs50pxgm0dxw9m49y3w1d53n1cvd8