I have always been confused by this, but have never really sought an explanation. Would anyone out there have an idea of why I can publish map services to Portal and can then visualize and interact with those map products using EI and Chrome, but when I use Firefox only my basemap loads, and none of my layers?
At first I thought it was my machine, so I didn't think anything of it, but we are only just implementing our web based GIS and now we are getting more interest and users. However, it turns out that it's not just my machine as I set up a co-worker to experiment with our new web application and he too was unable to load any of the layers using Firefox, but with EI and Chrome it was fine.
Is there a known problem with Firefox? I would find this odd because with ArcGIS Online Firefox works best in our office...and Chrome was the browser with issues.