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Quote from user's feedback: I've set Firefox a default browser of NetBeans. And it works, but not as I expected. Every time, before re-running the Web application I need to quit Firefox. Otherwise, I see next error message: "Firefox is already running...". I've set the "Browser Executable" field of advanced options to: /Applications/Firefox.app/Contents/MacOS/firefox
Mac version of Firefox does not seem to support the remote command interface that we are using for other Unix systems to communicate with already started browser. I have sent inquiry to the mozilla team: http://forums.mozillazine.org/viewtopic.php?p=2416310 Decreasing priority as the problem is affecting a small fraction of users (most Mac-lovers will stick to Safari browser) and there are easy workarounds - set Firefox as default browser
I meant default *OS X* browser (Safari-Preferences-Default Web Browser)
See also: http://www.netbeans.org/issues/show_bug.cgi?id=76970
*** This issue has been marked as a duplicate of 76970 ***