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diff -r 22fc47c968f2 toolkit/xre/nsXREDirProvider.cpp
--- a/toolkit/xre/nsXREDirProvider.cpp Mon Dec 14 15:09:17 2020 +0000
+++ b/toolkit/xre/nsXREDirProvider.cpp Tue Feb 23 23:38:56 2021 +0100
@@ -11,6 +11,7 @@
#include "jsapi.h"
#include "xpcpublic.h"
+#include "prenv.h"
#include "nsIAppStartup.h"
#include "nsIFile.h"
@@ -305,7 +306,8 @@
"/usr/lib/mozilla"_ns
# 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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