They expired on the 14th March 2014 If it is a certificate issue maybe try moving your system time back a year
I see Skype on the list. I haven't used it for weeks, if not months. I've just tried logging in and it worked fine. Then I tried all the URLs on the list (addons.mozilla.org, live.*.com etc) and they all worked fine. WTF?
There were generated some fake certificates years ago from "trusted" CA which was hacked. To prevent using these hacked fake certificates, Nokia released last firmware PR1.3.1 which blacklisted all these certificates...