--- firefox-68.0.1/gfx/2d/HelpersCairo.h.old 2019-07-17 20:51:26.000000000 +0000 +++ firefox-68.0.1/gfx/2d/HelpersCairo.h 2019-08-10 11:38:36.047380153 +0000 @@ -149,7 +149,7 @@ case SurfaceFormat::R5G6B5_UINT16: return CAIRO_FORMAT_RGB16_565; default: - gfxCriticalError() << "Unknown image format " << (int)format; + //gfxCriticalError() << "Unknown image format " << (int)format; return CAIRO_FORMAT_ARGB32; } }