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diff -up firefox-31.3.0/mozilla-esr31/extensions/auth/nsAuthSambaNTLM.cpp.old firefox-31.3.0/mozilla-esr31/extensions/auth/nsAuthSambaNTLM.cpp
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--- firefox-31.3.0/mozilla-esr31/extensions/auth/nsAuthSambaNTLM.cpp.old	2014-11-25 12:23:22.000000000 +0100
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+++ firefox-31.3.0/mozilla-esr31/extensions/auth/nsAuthSambaNTLM.cpp	2014-12-23 15:26:36.606674625 +0100
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@@ -174,7 +174,7 @@ nsAuthSambaNTLM::SpawnNTLMAuthHelper()
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         return NS_ERROR_FAILURE;
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     const char* const args[] = {
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-        "ntlm_auth",
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+        "/usr/bin/ntlm_auth",
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         "--helper-protocol", "ntlmssp-client-1",
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         "--use-cached-creds",
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         "--username", username,