What does this mean when I try to open a new window "Exc in ev handl: TypeError: brw is undefined

The above message pops up when I click on new window, once I click OK the message goes and a blank new window does appear. It has also just happened when I was in BBC language site and tried to open a link, the message appeared but once I clicked OK the message went and the link did open. It does not happen when I open a new tab. This has only just started to happen over the last few days.

This issue can be caused by the McAfee Site Advisor extension
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode

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What does this mean when I try to open a new window "Exc in ev handl: TypeError: brw is undefined

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