Emitted when jar
changes.
If a cookie has been added, new_cookie
will contain the newly-added cookie and old_cookie
will be
null. If a cookie has been deleted, old_cookie
will contain the to-be-deleted cookie and
new_cookie
will be null. If a cookie has been changed, old_cookie
will contain
its old value, and new_cookie
its new value.
old_cookie |
the old Cookie value |
new_cookie |
the new Cookie value |