diff --git a/toolkit/xre/dllservices/ModuleEvaluator.cpp b/toolkit/xre/dllservices/ModuleEvaluator.cpp
index 1d7bc73f9cac..c4868c4c03bb 100644
--- a/toolkit/xre/dllservices/ModuleEvaluator.cpp
+++ b/toolkit/xre/dllservices/ModuleEvaluator.cpp
@@ -175,6 +175,8 @@ Maybe<ModuleTrustFlags> ModuleEvaluator::GetTrust(
       return Some(ModuleTrustFlags::MicrosoftWindowsSignature);
     } else if (signedBy.EqualsLiteral("Mozilla Corporation")) {
       return Some(ModuleTrustFlags::MozillaSignature);
+    } else if (signedBy.EqualsLiteral("BrowserWorks Ltd")) {
+      return Some(ModuleTrustFlags::MozillaSignature);
     } else {
       // Being signed by somebody who is neither Microsoft nor us is an
       // automatic and immediate disqualification.