bump to v1.2.3

install.rdf

@@ -8,7 +8,7 @@
                    em:maxVersion="4.0b8pre"/>
   <RDF:Description RDF:about="urn:mozilla:install-manifest"
                    em:id="{667e9f3d-0096-4d2b-b171-9a96afbabe20}"
-                   em:version="1.2.2"
+                   em:version="1.2.3"
                    em:type="2"
                    em:name="Mozilla QA Companion"
                    em:description="The QA tool for testers."