--- a/xpi/resources/install.rdf
+++ b/xpi/resources/install.rdf
@@ -78,10 +78,14 @@
 		<em:file>
 			<Description about="urn:mozilla:extension:file:chatzilla.jar">
 				<em:package>content/chatzilla/</em:package>
 				<em:package>content/chatzilla/ff/</em:package>
 				<em:locale>locale/en-US/chatzilla/</em:locale>
 				<em:skin>skin/modern/chatzilla/</em:skin>
 			</Description>
 		</em:file>
+
+		<!-- force unpack the xpi, otherwise window icons do not work
+		     on Gecko 2.0 and higher -->
+		<em:unpack>true</em:unpack>
 	</Description>
 </RDF>