diff --git a/xpcom/components/nsComponentManager.cpp b/xpcom/components/nsComponentManager.cpp
index d9b227f9ca3..8a5c0955ebc 100644
--- a/xpcom/components/nsComponentManager.cpp
+++ b/xpcom/components/nsComponentManager.cpp
@@ -61,7 +61,6 @@
 #include "ManifestParser.h"
 #include "mozilla/Services.h"
 
-#include "nsManifestLineReader.h"
 #include "mozilla/GenericFactory.h"
 #include "nsSupportsPrimitives.h"
 #include "nsArray.h"
diff --git a/xpcom/ds/nsManifestLineReader.h b/xpcom/ds/nsManifestLineReader.h
deleted file mode 100644
index 643f5a2f3ab..00000000000
--- a/xpcom/ds/nsManifestLineReader.h
+++ /dev/null
@@ -1,89 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef nsManifestLineReader_h__
-#define nsManifestLineReader_h__
-
-#include "nspr.h"
-#include "nsDebug.h"
-
-class nsManifestLineReader
-{
-public:
-    nsManifestLineReader() : mBase(nullptr) {} 
-    ~nsManifestLineReader() {}
-
-    void Init(char* base, uint32_t flen) 
-    {
-        mBase = mCur = mNext = base; 
-        mLength = 0;
-        mLimit = base + flen;
-    }
-
-    bool NextLine()
-    {
-        if(mNext >= mLimit)
-            return false;
-        
-        mCur = mNext;
-        mLength = 0;
-        
-        while(mNext < mLimit)
-        {
-            if(IsEOL(*mNext))
-            {
-                *mNext = '\0';
-                for(++mNext; mNext < mLimit; ++mNext)
-                    if(!IsEOL(*mNext))
-                        break;
-                return true;
-            }
-            ++mNext;
-            ++mLength;
-        }
-        return false;        
-    }
-
-    int ParseLine(char** chunks, int* lengths, int maxChunks)
-    {
-        NS_ASSERTION(mCur && maxChunks && chunks, "bad call to ParseLine");
-        int found = 0;
-        chunks[found++] = mCur;
-
-        if(found < maxChunks)
-        {
-            char *lastchunk = mCur;
-            int *lastlength = lengths;
-            for(char* cur = mCur; *cur; cur++)
-            {
-                if(*cur == ',')
-                {
-                    *cur = 0;
-                    // always fill in the previous chunk's length
-                    *lastlength++ = cur - lastchunk;
-                    chunks[found++] = lastchunk = cur+1;
-                    if(found == maxChunks)
-                        break;
-                }
-            }
-            // crazy pointer math - calculate the length of the final chunk
-            *lastlength = (mCur + mLength) - lastchunk;
-        }
-        return found;
-    }
-
-    char*       LinePtr() {return mCur;}    
-    uint32_t    LineLength() {return mLength;}    
-
-    bool        IsEOL(char c) {return c == '\n' || c == '\r';}
-private:
-    char*       mCur;
-    uint32_t    mLength;
-    char*       mNext;
-    char*       mBase;
-    char*       mLimit;
-};
-
-#endif