This file is indexed.

/usr/lib/firefox/distribution/searchplugins/locale/en-US/twitter.xml is in firefox 28.0+build2-0ubuntu2.

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

The actual contents of the file can be viewed below.

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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/. -->

<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
<ShortName>Twitter</ShortName>
<Description>Realtime Twitter Search</Description>
<InputEncoding>UTF-8</InputEncoding>
<Image width="16" height="16">data:image/x-icon;base64,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</Image>
<SearchForm>https://twitter.com/search/</SearchForm>
<Url type="text/html" method="GET" template="https://twitter.com/search">
  <Param name="q" value="{searchTerms}"/>
  <Param name="partner" value="Firefox"/>
  <Param name="source" value="desktop-search"/>
</Url>
</SearchPlugin>