User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:220.127.116.11) Gecko/20061204 Firefox/18.104.22.168 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; nl; rv:22.214.171.124) Gecko/20061204 Firefox/126.96.36.199 When i close a page with a frame on it, it will give me a alert with typeerror: window._content has no properties. The error only occurs when the page is not fully loaded yet. Reproducible: Always Steps to Reproduce: 1.open a new tab 2.on that tab, go to a page with a frame on it 3.when the page is loading, close the tab 4.you will get the error Actual Results: You will get a message box with the message: window._content has no properties. Expected Results: Just close the page without that messagebox.
Please test this in Firefox's safe mode, this sounds like a problem caused by an extension
I don't get the alert when i try it in safe mode.
This is an extension issue, I suggest disabling a few of your extensions at a time to narrow it down and then notifying the extension author. The Mozillazine forums or IRC chat can help you further http://www.mozilla.org/support