Comment 14 for bug 473677

This is reproducible on the webtogs website:

http://www.webtogs.co.uk/Icebreaker_Long_Sleeve_Base_Layers__0/

with 3rd party cookies set to "ask me every time".

Setting to "until they expire" results in the site working.

The error reported in the console is:

Error: uncaught exception: [Exception... "Security error" code: "1000" nsresult: "0x805303e8 (NS_ERROR_DOM_SECURITY_ERR)" location: "http://cdn.webtogs.com/js/mootools-1.2.5-core-yc.js Line: 24"]