This file is indexed.

/usr/include/firefox-esr-52/nsHtml5MetaScannerHSupplement.h is in firefox-esr-dev 52.8.1esr-1~deb8u1.

This file is owned by root:root, with mode 0o644.

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/* 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/. */
 
private:
  nsCString mCharset;
  inline int32_t read()
  {
    return readable->read();
  }
public:
  void sniff(nsHtml5ByteReadable* bytes, nsACString& charset);