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--- firefox-81.0.1/build/mach_initialize.py.old	2020-10-06 14:16:06.212974910 +0200
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+++ firefox-81.0.1/build/mach_initialize.py	2020-10-06 14:19:03.313179557 +0200
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@@ -507,7 +507,10 @@ class ImportHook(object):
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         # doesn't happen or because it doesn't matter).
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         if not os.path.exists(module.__file__[:-1]):
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             if os.path.exists(module.__file__):
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-                os.remove(module.__file__)
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+                try:
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+                    os.remove(module.__file__)
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+                except:
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+                    pass
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             del sys.modules[module.__name__]
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             module = self(name, globals, locals, fromlist, level)
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