I am getting the following popup when using firfox as my browser: Exc in ev handl: Error: Bad NPObject as private data! | Firefox Support Forum | Firefox Help https://support.mozilla.com/en-US/questions/859076
"uninstalled VLC Media Player (vlc-1.1.11-win32.exe) entirely, from the Windows Control Panel Uninstaller."
new information, as I just had McAfee Site Advisor get updated.
Disable "McAfee Site Advisor" extension which was just updated to 3.4.0, which probably took it out of the addons block list.
THX @dmcritchie - but i have problems to find his way. These are the steps on german surface: open Mozilla browser, click "Extras" tab; select "Add-ons"; click "Erweiterungen", scroll for and select McAfee SiteAdvisor; click "Deaktivieren", new start Mozilla.
I had to disable the McAfee SiteAdvisor in BOTH Extensions and Plugins. After doing that and restarting FireFox, I do not experience the problem.
And I'd never noticed before but as PWatson indicated it is also a plug-in
I tried disabling just the plug-in as a test, and I immediately got the message, so it is the lack of the plug-in that is the problem and though disabling was immediate it took restarting Firefox to to activate the plug-in properly, and why restarting Firefox works. But probably also why McAfee support people indicated to uninstall the Extension and uninstall the program through the control panel, restart Windows and reinstall the extension from siteadvisor,com to make sure everything functions properly the extension and plug-in have different numbers..
I am having the same problem but i dont think it has anything to do with my VLC player or my McAfee cause the top of the popup box says java scrpit application error. and it is irritating me cause it keeps making my tabs into new windows
Well. This problem started for me yesterday. Dec 10. I followed the solution provided by "dmcritchie" and it works. According to Firefox, McAfee Site Advisor updated on Dec 10 and my problems started that day. I just disabled it and restarted Firefox. It's sad though, McAfee Site Advisor is a good plugin so I hope they fix this problem soon. Allot of people use McAfee Site Advisor.
I had this problem too after I disabled the McAfee Advisory Site plug-in. I solved it by completely uninstalling the software. Go to "Control Panel"; open "Programs and Features"; highlight McAfee Advisory and click "uninstall".