I was trying to bring up an itinerary in Firefox this afternoon and the screen kept going back to the itinerary list page. This happened consistently 4 or 5 times. When I switched to Chrome, I was able to bring up the itinerary just fine. I went back to try Firefox, and again it wouldn't bring up the itinerary.

Just now I was trying to select an EC seat on an CDG-ATL flight in Firefox, and the website refused to save the seat after selecting it. I tried using IE and had the same behavior. Then I tried using the Delta iPhone app, and it wouldn't let me select an EC seat at all. Finally, I tried to save the seat using Chrome and it finally stuck.

So I guess in my case, Chrome has seemed to work best and the other browsers and apps have had issues.