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diff --git a/toolkit/xre/nsXREDirProvider.cpp b/toolkit/xre/nsXREDirProvider.cpp
index 380c1c1..255539f 100644
--- a/toolkit/xre/nsXREDirProvider.cpp
+++ b/toolkit/xre/nsXREDirProvider.cpp
@@ -306,7 +306,8 @@ GetSystemParentDirectory(nsIFile** aFile)
"/usr/lib/mozilla"
#endif
);
- rv = NS_NewNativeLocalFile(dirname, false, getter_AddRefs(localDir));
+ const char* pathVar = PR_GetEnv("MOZ_SYSTEM_DIR");
+ rv = NS_NewNativeLocalFile((pathVar && *pathVar) ? nsDependentCString(pathVar) : reinterpret_cast<const nsCString&>(dirname), false, getter_AddRefs(localDir));
#endif
if (NS_SUCCEEDED(rv)) {
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