diff --git a/netwerk/protocol/http/nsHttpHandler.cpp b/netwerk/protocol/http/nsHttpHandler.cpp
index 0f4c94202..2691a2a77 100644
--- a/netwerk/protocol/http/nsHttpHandler.cpp
+++ b/netwerk/protocol/http/nsHttpHandler.cpp
@@ -199,7 +199,7 @@ nsHttpHandler::nsHttpHandler()
     , mLegacyAppVersion("5.0")
     , mProduct("Goanna")
     , mCompatFirefoxEnabled(false)
-    , mCompatFirefoxVersion("52.9")
+    , mCompatFirefoxVersion("68.9")
     , mUserAgentIsDirty(true)
     , mAcceptLanguagesIsDirty(true)
     , mPromptTempRedirect(true)