After updating Firefox today I encountered the following error when trying to work with the Exchange Control Panel in Exchange 2010 RTM:
Going by the message, “Permission denied for .. to get property Windows.frameElement from”, it looks like a cross-site frame protection issue. I don’t know if the update is responsible for this (Firefox 3.6.8) or this is also the behaviour of earlier Firefox versions. I checked it against IE and that has no issue.
So far for multi-browser support.