Remove custom search from Linux

**** Remove the Linux Mint Custom search ****

o Edit /usr/lib/firefox-addons/searchplugins/google.xml and replace the contents with the text below.

<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
  <ShortName>Google</ShortName>
  <Description>Google Search</Description>
  <InputEncoding>UTF-8</InputEncoding>
  <Image width="16" height="16">data:image/x-icon;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAaRJREFUeNpiVIg5JRURw0A0YAHio943kYV%2B%2Ff33%2BdvvX7%2F%2FMjEx8nKycrGzwKXOiPKzICvdeezLhCV3jp15%2Bfv%2FX0YGhv8MDDxMX2qKTIw0RK10eYD6QYqATvoPBkt3f5K0W9Ew4fjTFz%2F%2Bw8Dm3W8UPeZxqFa%2BevsFyD0twgfVsOfkRxHrtfV9u5BVQ8Crd98%2FffkGYQM1QJ20%2FfSPv79eNxQGYfpSVJADmcvEAHbr7oOX2dj%2FERNKIA2%2F%2F%2Fz%2FxfCDhYVoDUDw5P6vf9%2B5iY0HVmZGQWm%2BN3fff%2Fn2k4eLHS739x%2FDiRs%2Ff%2F%2F5x8HO%2FOHzN3djfqgNjIwMgc6qzLx%2Fpy47j2zY%2Feff06tXhOUucgxeun33AUZGpHh4%2Bvo7t8EyIJqz%2FhpasD59%2B5dNrqdnznZIsEL9ICXCsWuBCwvTv%2FymS5PWPP32ExEALz%2F%2BB5r848cPCJcRaMP9xaYQzofPPzfuvrnj0Jst%2B5%2F8%2Bc4sLPeDkYlRgJc93VPE18NIXkYUmJYQSQMZ%2FP3379uPH7%2F%2F%2FEETBzqJ0WqLGvFpe2LCC4AAAwAyjg7ENzDDWAAAAABJRU5ErkJggg%3D%3D</Image>
  <Url type="application/x-suggestions+json" method="GET" template="http://suggestqueries.google.com/complete/search?output=firefox&amp;client=firefox&amp;hl={moz:locale}&amp;q={searchTerms}"/>
  <Url type="text/html" method="GET" template="http://www.google.com/search">
    <Param name="q" value="{searchTerms}"/>
    <Param name="ie" value="utf-8"/>
    <Param name="oe" value="utf-8"/>
    <Param name="aq" value="t"/>
    <!-- Dynamic parameters -->
    <Param name="rls" value="{moz:distributionID}:{moz:locale}:{moz:official}"/>
    <MozParam name="client" condition="defaultEngine" trueValue="firefox-a" falseValue="firefox"/>
  </Url>
  <SearchForm>http://www.google.com/firefox</SearchForm>
</SearchPlugin>