Comment 3 for bug 307103

Hi,
I can't reproduce the problem.
But hope these will help:

http://wiki.netbeans.org/FirefoxAndNetBeans

https://bugzilla.redhat.com/show_bug.cgi?id=467546
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WORKAROUND

Please, change command line arguments for the Firefox Web Browser:
1. Start NetBeans
2. Open the "Options" dialog via the menu item [Main Menu]/Tools/Options
3. Select the "General" tab
4. Open the dialog "Web Browsers" by pressing the button "Web Browser: Edit..."
5. Select the "Firefox" item in the list "Web Browsers"
6. Change a value of the text box "Arguments" from
-remote "openURL({URL})" to {URL}
(there are also other options like -new-window {URL} and -new-tab {URL})

7. Close all the opened dialogs by pressing the "OK" buttons.

Note, these changes will affect a current user only.
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