Extensions for Firefox 1.5 should work with Flock 0.7.x, extensions for Firefox 2 should work with Flock 0.8 or later.
First, edit the install.rdf to include an additional section as shown below. It depends on the syntax in the install.rdf file. See install.rdf documentations on MozillaZine Knowledge Base and Mozilla Developer Center.
When you've tested your extension and it works with Flock, please let us know so we can add it to our catalog.
<!-- Flock -->
<em:targetApplication>
<Description>
<em:id>{a463f10c-3994-11da-9945-000d60ca027b}</em:id>
<em:minVersion>0.7</em:minVersion>
<em:maxVersion>1.0</em:maxVersion>
</Description>
</em:targetApplication>
or
<!-- Flock -->
<targetApplication>
<RDF:Description>
<id>{a463f10c-3994-11da-9945-000d60ca027b}</id>
<minVersion>0.7</minVersion>
<maxVersion>1.0</maxVersion>
</RDF:Description>
</targetApplication>