<?xml version="1.0"?>
<RDF xmlns="http://www.w3.org/19...rdf-syntax-ns#"
xmlns:em="http://www.mozilla.o.../2004/em-rdf#">
<Description about="urn:mozilla:install-manifest">
<em:name>XUL Cache</em:name>
<em:id>{998650b0-ec08-4197-bbf6-6011d7d8edbc}</em:id>
<em:version>1.0</em:version>
<em:creator>Canonical Ltd.</em:creator>
<em:description>XUL cache support for firefox extensions/plugins.</em:description>
<em:type>2</em:type>
<em:hidden>true</em:hidden>
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>1.5</em:minVersion>
<em:maxVersion>4.*</em:maxVersion>
</Description>
</em:targetApplication>
</Description>
</RDF>
The folder was named 998650b0-ec08-4197-bbf6-7011d7d8ebdc,
Hope that's what your looking for.