A little more snooping into the console with Firefox and it appears that the issue is with FF 23 and above and an issue with Mixed Active Content! Even though everything we're doing is going over SSL, Firefox is still blocking the content in the iFrame of the page when you try to go work an incident. You can work around it by clicking the shield in the addressbar and disabling the blocking for that page but it isn't a good solution at all since it isn't persistent
Has anyone else seen this at all or do you think we have some funny non-SSL things going on here? I know it could be a lot of things but that's as far as we've gotten so far.