Here is the corresponding bug on Bugzilla : https://bugzilla.mozilla.org/show_bug.cgi?id=950399 https://bugzilla.mozilla.org/show_bug.cgi?id=950399 This what re

Here is the corresponding bug on Bugzilla : https://bugzilla.mozilla.org/show_bug.cgi?id=950399 https://bugzilla.mozilla.org/show_bug.cgi?id=950399 This what related to the way Facebook and Youtube sends cookies for all their subdomains, and not just www. (see https://bugzilla.mozilla.org/show_bug.cgi?id=950399#c55 https://bugzilla.mozilla.org/show_bug.cgi?id=950399#c55).