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o.n.m.extbrowser.plugins.ExternalBrowserPlugin uses HashMap awatingBrowserResponse with URL as the key. This should not be done for performance reasons, see http://blog.markfeeney.com/2010/11/java-uri-vs-url.html and numerous other blogs on this topic.
Also there is a typo: awatingBrowserResponse -> awaitingBrowserResponse
Cc'ing also David as he apparently wrote this code.
Fixed by http://hg.netbeans.org/web-main/rev/dae4c1ecf30c (typo) http://hg.netbeans.org/web-main/rev/ef09b37ed6c3 (URL replaced by String)
Thanks.