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.
Steps to Reproduce:
1. Install Google Toolbar or Yahoo Toolbar extension
2. Log in to Google or Yahoo respectively
Neither extension can read/set cookie via the XMLHttpRequest so they will not acknowledge that the user is logged in.
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.
*** This bug has been marked as a duplicate of bug 437174 ***