--- a/mozilla-bmo849632.patch	Wed Feb 19 22:51:20 2020 +0100
+++ b/mozilla-bmo849632.patch	Sat Mar 07 09:48:10 2020 +0100
@@ -10,7 +10,7 @@
      BEFORE_GL_CALL;
      mSymbols.fReadPixels(x, y, width, height, format, type, pixels);
      OnSyncCall();
-+#if MOZ_BIG_ENDIAN
++#if MOZ_BIG_ENDIAN()
 +    uint8_t* itr = (uint8_t*)pixels;
 +    for (GLsizei i = 0; i < width * height; i++) {
 +      NativeEndian::swapToLittleEndianInPlace((uint32_t*)itr, 1);