Our network/server/security guru applied the fix for this particular issue:
The issue stems for Firefox adhering to strict interpretation of the SSL certificate chain. The appropriate intermediate ???link??? between the THAWTE root Certification Authority and its Intermediate Certification Authority was not made inside the CITRIX Netscaler. Once the appropriate certificate was loaded and linked the issue was solved.
IE swallows a lot of error and does not allow them to come to the surface. Try setting your crossdomain.xml at https://gisservices.suffolkcountyny.gov secure attribute as true and not false, as you are using https.
I just take care of the development side, I do not have any access to the production servers and the production server guy is out of the office, I will ask him when he gets back.
I just tried on both my PC and an externally hooked up PC w/o success.
Do you have anything different on your Firefox settings from default?
The JavaScript app does display the map service when run from my internal test server however. It used to work in Firefox but does not load at all now probable due to the fact that the basemap cannot load.
We have an open ticket with ESRI on these issues and we are running ArcGIS server 10.22.