Sometimes 'debugger' is ignored?

"John J. Barton" <[email protected]> Thu, 18 Dec 2008 23:15:01 -0800
Newsgroups gmane.comp.mozilla.devel.jsdebugger
Message-ID <[email protected]>
In some cases the 'debugger' keyword fails to trigger jsd. Any ideas on 
a workaround?

jjb