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diff -up firefox-73.0/media/libaom/moz.build.old firefox-73.0/media/libaom/moz.build
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--- firefox-73.0/media/libaom/moz.build.old	2020-02-07 23:13:28.000000000 +0200
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+++ firefox-73.0/media/libaom/moz.build	2020-02-17 10:30:08.509805092 +0200
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@@ -55,7 +55,7 @@ elif CONFIG['CPU_ARCH'] == 'arm':
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     for f in SOURCES:
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         if f.endswith('neon.c'):
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-            SOURCES[f].flags += CONFIG['VPX_ASFLAGS']
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+            SOURCES[f].flags += CONFIG['NEON_FLAGS']
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     if CONFIG['OS_TARGET'] == 'Android':
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         # For cpu-features.h