In the patch of the bug 847714, the main frame buffer is created with an initial size of 16x16 pixels, to get the gl context, compare the wanted size with GL few constants, and then resized to the desired size. We would find a way to not create the first framebuffer of 16x16 pixels.

(In reply to Guillaume Abadie from comment #0) > In the patch of the bug 847714, the main frame buffer is created with an > initial size of 16x16 pixels, to get the gl context, compare the wanted size > with GL few constants, and then resized to the desired size. We would find a > way to not create the first framebuffer of 16x16 pixels. This is not quite the case. For a number of reasons, we no longer use the default framebuffer of the GLContext, so we just ask for a dummy one of size 16x16. We then create a framebuffer to act as our offscreen webgl buffer, and this framebuffer is of the proper requested size.

Oh, nevermind, this is changes proposed in that bug. Why would we take this change to begin with?