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diff -ru firefox-78.3.0/security/sandbox/linux/SandboxFilter.cpp firefox-78.4.0/security/sandbox/linux/SandboxFilter.cpp
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--- firefox-78.3.0/security/sandbox/linux/SandboxFilter.cpp	2020-09-14 21:21:02.000000000 +0200
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+++ firefox-78.4.0/security/sandbox/linux/SandboxFilter.cpp	2020-10-14 11:34:48.000000000 +0200
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@@ -243,14 +243,21 @@
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     auto path = reinterpret_cast<const char*>(aArgs.args[1]);
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     auto buf = reinterpret_cast<statstruct*>(aArgs.args[2]);
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     auto flags = static_cast<int>(aArgs.args[3]);
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+
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+    if (fd != AT_FDCWD && (flags & AT_EMPTY_PATH) != 0 &&
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+        strcmp(path, "") == 0) {
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+      return ConvertError(fstatsyscall(fd, buf));
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+    }
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+
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     if (fd != AT_FDCWD && path[0] != '/') {
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       SANDBOX_LOG_ERROR("unsupported fd-relative fstatat(%d, \"%s\", %p, %d)",
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                         fd, path, buf, flags);
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       return BlockedSyscallTrap(aArgs, nullptr);
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     }
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-    if ((flags & ~AT_SYMLINK_NOFOLLOW) != 0) {
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+    if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT)) != 0) {
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       SANDBOX_LOG_ERROR("unsupported flags %d in fstatat(%d, \"%s\", %p, %d)",
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-                        (flags & ~AT_SYMLINK_NOFOLLOW), fd, path, buf, flags);
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+                        (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT)), fd,
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+                        path, buf, flags);
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       return BlockedSyscallTrap(aArgs, nullptr);
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     }
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     return (flags & AT_SYMLINK_NOFOLLOW) == 0 ? broker->Stat(path, buf)