Firefox will only render the first frame when the window is created. After that the texture will not update.
If I try to minimize and then maximize that window the content stays all white.
If I try to resize that window the white square is updated accordingly.

Firefox will only render the first frame when the window is created. After that the texture will not update.
If I try to minimize and then maximize that window the content stays all white.
If I try to resize that window the white square is updated accordingly.