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diff -up firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py.rhel7-nasm firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py
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--- firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py.rhel7-nasm	2021-08-31 08:02:10.814740774 +0200
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+++ firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py	2021-08-31 08:04:03.967146994 +0200
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@@ -420,7 +420,7 @@ class AsmFlags(BaseCompileFlags):
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                 if self._context.config.substs.get("OS_ARCH") == "WINNT":
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                     debug_flags += ["-F", "cv8"]
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                 elif self._context.config.substs.get("OS_ARCH") != "Darwin":
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-                    debug_flags += ["-F", "dwarf"]
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+                    debug_flags += ["-f", "elf32"]
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             elif (
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                 self._context.config.substs.get("OS_ARCH") == "WINNT"
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                 and self._context.config.substs.get("CPU_ARCH") == "aarch64"