Hi, I had some old avalon-framework jars in my classpath. After removing them, I had no more Logging Error, but I had 'AWT-EventQueue-O' error when launching the javascript debugger. I had to apply patch https://bug414869.bugzilla.mozilla.org/attachment.cgi?id=300651 Now the javascript debugger works perfectly on macosx 10.5 Regards, Lionel
