diff --git a/mozilla/netwerk/base/public/nsReadLine.h b/mozilla/netwerk/base/public/nsReadLine.h
index 6c17e7ccaa0..394e245d1b9 100644
--- a/mozilla/netwerk/base/public/nsReadLine.h
+++ b/mozilla/netwerk/base/public/nsReadLine.h
@@ -60,7 +60,7 @@ NS_ReadLine (nsIInputStream* aStream, nsLineBuffer * aBuffer,
   nsAutoString temp;
   *more = PR_TRUE;
   PRBool eolStarted = PR_FALSE;
-  char eolchar;
+  char eolchar = '\0';
   aLine.Truncate();
   while (1) { // will be returning out of this loop on eol or eof
     if (aBuffer->empty) { // buffer is empty.  Read into it.
diff --git a/mozilla/netwerk/base/src/nsFileTransport.cpp b/mozilla/netwerk/base/src/nsFileTransport.cpp
index 4eb4cfc9380..9a039998a67 100644
--- a/mozilla/netwerk/base/src/nsFileTransport.cpp
+++ b/mozilla/netwerk/base/src/nsFileTransport.cpp
@@ -929,7 +929,7 @@ nsFileTransport::Process(nsIProgressEventSink *progressSink)
         if (mTransferAmount >= 0)
             transferAmt = PR_MIN(transferAmt, (PRUint32)mTransferAmount);
 
-        PRUint32 total, offset = mSinkWrapper->GetBytesWritten();
+        PRUint32 total = 0, offset = mSinkWrapper->GetBytesWritten();
 
         // Ask the provider for data
         nsresult status = mProvider->OnDataWritable(this, mContext,
diff --git a/mozilla/netwerk/streamconv/converters/nsFTPDirListingConv.cpp b/mozilla/netwerk/streamconv/converters/nsFTPDirListingConv.cpp
index bfab9821b08..5e1f40c0651 100644
--- a/mozilla/netwerk/streamconv/converters/nsFTPDirListingConv.cpp
+++ b/mozilla/netwerk/streamconv/converters/nsFTPDirListingConv.cpp
@@ -927,7 +927,7 @@ nsFTPDirListingConv::DigestBufferLines(char *aBuffer, nsCString &aString) {
             int flagcwd = 0;
             int when = 0;
             int flagsize = 0;
-            unsigned long size;
+            unsigned long size = 0;
             PRBool processing = PR_TRUE;
             while (*line && processing)
                 switch (*line) {
diff --git a/mozilla/netwerk/test/TestPageLoad.cpp b/mozilla/netwerk/test/TestPageLoad.cpp
index 9777086211b..0bbdbfa177d 100644
--- a/mozilla/netwerk/test/TestPageLoad.cpp
+++ b/mozilla/netwerk/test/TestPageLoad.cpp
@@ -195,7 +195,7 @@ MyListener::OnDataAvailable(nsIRequest *req, nsISupports *ctxt,
                             PRUint32 offset, PRUint32 count)
 {
     //printf(">>> OnDataAvailable [count=%u]\n", count);
-    nsresult rv;
+    nsresult rv = NS_ERROR_FAILURE;
     PRUint32 bytesRead=0;
     int i=0;
     char buf[1024];
diff --git a/mozilla/netwerk/test/TestSocketTransport.cpp b/mozilla/netwerk/test/TestSocketTransport.cpp
index a9f22af2289..a7176fe0773 100644
--- a/mozilla/netwerk/test/TestSocketTransport.cpp
+++ b/mozilla/netwerk/test/TestSocketTransport.cpp
@@ -419,7 +419,7 @@ TestConnection::Run(void)
 
 nsresult TestConnection::WriteBuffer(void)
 {
-  nsresult rv;
+  nsresult rv = NS_ERROR_FAILURE;
   char *buffer;
   PRInt32 size;
   PRUint32 bytesWritten;