diff --git a/dom/webbrowserpersist/nsWebBrowserPersist.cpp b/dom/webbrowserpersist/nsWebBrowserPersist.cpp
index 55fcd021905a..7a1ae116135a 100644
--- a/dom/webbrowserpersist/nsWebBrowserPersist.cpp
+++ b/dom/webbrowserpersist/nsWebBrowserPersist.cpp
@@ -1149,8 +1149,6 @@ NS_IMETHODIMP nsWebBrowserPersist::OnStatus(nsIRequest* request,
     switch (status) {
       case NS_NET_STATUS_RESOLVING_HOST:
       case NS_NET_STATUS_RESOLVED_HOST:
-      case NS_NET_STATUS_BEGIN_FTP_TRANSACTION:
-      case NS_NET_STATUS_END_FTP_TRANSACTION:
       case NS_NET_STATUS_CONNECTING_TO:
       case NS_NET_STATUS_CONNECTED_TO:
       case NS_NET_STATUS_TLS_HANDSHAKE_STARTING:
diff --git a/js/xpconnect/src/xpc.msg b/js/xpconnect/src/xpc.msg
index 3d704d93d5a6..4b698af168e9 100644
--- a/js/xpconnect/src/xpc.msg
+++ b/js/xpconnect/src/xpc.msg
@@ -170,11 +170,6 @@ XPC_MSG_DEF(NS_ERROR_REMOTE_XUL                     , "Attempt to access remote
 XPC_MSG_DEF(NS_ERROR_LOAD_SHOWED_ERRORPAGE          , "The load caused an error page to be displayed.")
 XPC_MSG_DEF(NS_ERROR_BLOCKED_BY_POLICY              , "The request was blocked by a policy set by the system administrator.")
 
-XPC_MSG_DEF(NS_ERROR_FTP_LOGIN                      , "FTP error while logging in")
-XPC_MSG_DEF(NS_ERROR_FTP_CWD                        , "FTP error while changing directory")
-XPC_MSG_DEF(NS_ERROR_FTP_PASV                       , "FTP error while changing to passive mode")
-XPC_MSG_DEF(NS_ERROR_FTP_PWD                        , "FTP error while retrieving current directory")
-XPC_MSG_DEF(NS_ERROR_FTP_LIST                       , "FTP error while retrieving a directory listing")
 XPC_MSG_DEF(NS_ERROR_UNKNOWN_HOST                   , "The lookup of the hostname failed")
 XPC_MSG_DEF(NS_ERROR_DNS_LOOKUP_QUEUE_FULL          , "The DNS lookup queue is full")
 XPC_MSG_DEF(NS_ERROR_UNKNOWN_PROXY_HOST             , "The lookup of the proxy hostname failed")
diff --git a/xpcom/base/ErrorList.py b/xpcom/base/ErrorList.py
index a8f5fa0c26fd..327c34556c56 100755
--- a/xpcom/base/ErrorList.py
+++ b/xpcom/base/ErrorList.py
@@ -362,14 +362,6 @@ with modules["NETWORK"]:
     # probably in the process of being torn down.
     errors["NS_ERROR_DOCSHELL_DYING"] = FAILURE(78)
 
-    # FTP specific error codes:
-
-    errors["NS_ERROR_FTP_LOGIN"] = FAILURE(21)
-    errors["NS_ERROR_FTP_CWD"] = FAILURE(22)
-    errors["NS_ERROR_FTP_PASV"] = FAILURE(23)
-    errors["NS_ERROR_FTP_PWD"] = FAILURE(24)
-    errors["NS_ERROR_FTP_LIST"] = FAILURE(28)
-
     # DNS specific error codes:
 
     # The lookup of a hostname failed.  This generally refers to the hostname
@@ -426,10 +418,6 @@ with modules["NETWORK"]:
     # should NOT free it.
     errors["NS_SUCCESS_ADOPTED_DATA"] = SUCCESS(90)
 
-    # FTP
-    errors["NS_NET_STATUS_BEGIN_FTP_TRANSACTION"] = SUCCESS(27)
-    errors["NS_NET_STATUS_END_FTP_TRANSACTION"] = SUCCESS(28)
-
     # This success code may be returned by nsIAuthModule::getNextToken to
     # indicate that the authentication is finished and thus there's no need
     # to call getNextToken again.