gecko/browser/app/blocklist.xml

<?xml version="1.0"?>
<blocklist xmlns="http://www.mozilla.org/2006/addons-blocklist">
  <emItems>
    <emItem id="fdm_ffext@freedownloadmanager.org">
      <versionRange minVersion="1.0" maxVersion="1.3.1">
        <targetApplication id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}">
           <versionRange minVersion="3.0a1" maxVersion="*"/>
        </targetApplication>
      </versionRange>
    </emItem>
    <emItem id="mozilla_cc@internetdownloadmanager.com">
      <versionRange minVersion="2.1" maxVersion="3.3">
        <targetApplication id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}">
           <versionRange minVersion="3.0a1" maxVersion="*"/>
        </targetApplication>
      </versionRange>
    </emItem>
  </emItems>
<pluginItems>
  <pluginItem>
    <match name="name" exp="Yahoo Application State Plugin"/>
    <match name="description" exp="Yahoo Application State Plugin"/>
    <match name="filename" exp="npYState.dll"/>
  </pluginItem>
</pluginItems>
</blocklist>