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diff -up firefox-78.9.0/security/certverifier/NSSCertDBTrustDomain.cpp.slot-fail firefox-78.9.0/security/certverifier/NSSCertDBTrustDomain.cpp
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--- firefox-78.9.0/security/certverifier/NSSCertDBTrustDomain.cpp.slot-fail	2021-04-08 08:02:13.879018493 +0200
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+++ firefox-78.9.0/security/certverifier/NSSCertDBTrustDomain.cpp	2021-04-08 08:05:56.713623197 +0200
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@@ -118,7 +118,7 @@ static Result FindRootsWithSubject(Uniqu
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     CERTCertificateList* rawResults = nullptr;
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     if (PK11_FindRawCertsWithSubject(rootsModule->slots[slotIndex], &subject,
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                                      &rawResults) != SECSuccess) {
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-      return Result::FATAL_ERROR_LIBRARY_FAILURE;
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+      continue;
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     }
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     // rawResults == nullptr means we didn't find any matching certificates
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     if (!rawResults) {