diff -up firefox-65.0/netwerk/protocol/http/nsHttpHandler.cpp.fedora-ua firefox-65.0/netwerk/protocol/http/nsHttpHandler.cpp

--- firefox-65.0/netwerk/protocol/http/nsHttpHandler.cpp.fedora-ua	2019-01-28 14:28:35.806375063 +0100

+++ firefox-65.0/netwerk/protocol/http/nsHttpHandler.cpp	2019-01-28 14:30:25.886917219 +0100

@@ -873,6 +873,7 @@ void nsHttpHandler::BuildUserAgent() {

   mUserAgent.SetCapacity(mLegacyAppName.Length() + mLegacyAppVersion.Length() +

 #ifndef UA_SPARE_PLATFORM

                          mPlatform.Length() +

+                         mPlatform.Length() + 8 +

 #endif

                          mOscpu.Length() + mMisc.Length() + mProduct.Length() +

                          mProductSub.Length() + mAppName.Length() +

@@ -891,6 +892,7 @@ void nsHttpHandler::BuildUserAgent() {

   if (!mPlatform.IsEmpty()) {

     mUserAgent += mPlatform;

     mUserAgent.AppendLiteral("; ");

+    mUserAgent.AppendLiteral("Fedora; ");

   }

 #endif

   if (!mCompatDevice.IsEmpty()) {