User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0 If the accept third-party cookie option is not checked, then cookies are not sent when extensions issue a XMLHttpRequest send request to a web site nor cookies received when the response come in. This effectively breaks any extension which accesses a web site that requires logging in, via the XMLHttpRequest component. An example of two extensions which don't work with the "accept third-party cookies" check box option unchecked are Google Toolbar and Yahoo Toolbar, but there are a number of other ones. A work around is to specify an "allow" or "allow for session" exception for the web site being accessed via the XMLHttpRequest. Reproducible: Always Steps to Reproduce: 1. Install Google Toolbar or Yahoo Toolbar extension 2. Log in to Google or Yahoo respectively Actual Results: Neither extension can read/set cookie via the XMLHttpRequest so they will not acknowledge that the user is logged in. Expected Results: They should indicate the user is logged in. This is a regression from Firefox 2.0.
I'd really like to get this fixed ASAP, since I'm now getting a few messages a day telling me my extension no longer works in Firefox 3.0 and I have to write back telling them to add an allow exception.
FWIW, this is confirmed by me and needs to be addressed.