I couldn’t get it to launch at all in Firefox.
Might need to disable the pop-up blocker. Works fine in Firefox for Windows.
UPDATE
I tried these registry settings (gateway.messenger.hotmail.com:80) from home, and Messenger could not longer connect at all! Can someone confirm that they are using these settings and are able to connect?
I tried the original ones in my post and they worked perfectly (post that started the thread) at first.
I then noticed that it became flaky after a couple of days, not sure whether the gateway server sometimes works and sometimes doesn’t, I know for certain our firewall rules haven’t changed.
Will try your reg setting from work tomorrow.
Hmm… am still finding elements of using the gateway.messenger.hotmail.com:80 fix intermittent – it seems to disappear for a few days then come back for a while… sporadic.