diff --git a/netwerk/dns/DNS.cpp b/netwerk/dns/DNS.cpp
index f12307125d65..0c620af74f02 100644
--- a/netwerk/dns/DNS.cpp
+++ b/netwerk/dns/DNS.cpp
@@ -308,8 +308,8 @@ bool NetAddr::operator==(const NetAddr& other) const {
 #if defined(XP_UNIX)
   }
   if (this->raw.family == AF_LOCAL) {
-    return PL_strncmp(this->local.path, other.local.path,
-                      ArrayLength(this->local.path));
+    return strncmp(this->local.path, other.local.path,
+                   ArrayLength(this->local.path));
 #endif
   }
   return false;
diff --git a/netwerk/mime/nsMIMEHeaderParamImpl.cpp b/netwerk/mime/nsMIMEHeaderParamImpl.cpp
index 3180fce0f525..ffc85d89eb99 100644
--- a/netwerk/mime/nsMIMEHeaderParamImpl.cpp
+++ b/netwerk/mime/nsMIMEHeaderParamImpl.cpp
@@ -1255,7 +1255,7 @@ nsresult DecodeRFC2047Str(const char* aHeader,
       // bug 227290. ignore an extraneous '=' at the end.
       // (# of characters in B-encoded part has to be a multiple of 4)
       int32_t n = r - (q + 2);
-      R -= (n % 4 == 1 && !PL_strncmp(r - 3, "===", 3)) ? 1 : 0;
+      R -= (n % 4 == 1 && !strncmp(r - 3, "===", 3)) ? 1 : 0;
     }
     // Bug 493544. Don't decode the encoded text until it ends
     if (R[-1] != '=' &&
diff --git a/netwerk/protocol/http/nsHttpHandler.cpp b/netwerk/protocol/http/nsHttpHandler.cpp
index 954e1ce98a0d..71daff8e0441 100644
--- a/netwerk/protocol/http/nsHttpHandler.cpp
+++ b/netwerk/protocol/http/nsHttpHandler.cpp
@@ -1007,9 +1007,9 @@ void nsHttpHandler::PrefsChanged(const char* pref) {
     gIOService->NotifySocketProcessPrefsChanged(pref);
   }
 
-#define PREF_CHANGED(p) ((pref == nullptr) || !PL_strcmp(pref, p))
+#define PREF_CHANGED(p) ((pref == nullptr) || !strcmp(pref, p))
 #define MULTI_PREF_CHANGED(p) \
-  ((pref == nullptr) || !PL_strncmp(pref, p, sizeof(p) - 1))
+  ((pref == nullptr) || !strncmp(pref, p, sizeof(p) - 1))
 
   // If a security pref changed, lets clear our connection pool reuse
   if (MULTI_PREF_CHANGED(SECURITY_PREFIX)) {
diff --git a/netwerk/protocol/websocket/WebSocketChannel.cpp b/netwerk/protocol/websocket/WebSocketChannel.cpp
index 531561f74e90..82b87fbb57d4 100644
--- a/netwerk/protocol/websocket/WebSocketChannel.cpp
+++ b/netwerk/protocol/websocket/WebSocketChannel.cpp
@@ -3905,7 +3905,7 @@ WebSocketChannel::OnStartRequest(nsIRequest* aRequest) {
       rv = NS_ERROR_ILLEGAL_VALUE;
       val = mProtocol.BeginWriting();
       while ((token = nsCRT::strtok(val, ", \t", &val))) {
-        if (PL_strcmp(token, respProtocol.get()) == 0) {
+        if (strcmp(token, respProtocol.get()) == 0) {
           rv = NS_OK;
           break;
         }