Error when attemtping to open the application catalog with Firefox

Question

We are actively migrating to our CM2012 R2 CU1 environment. However, we have a number of different browsers and versions in use.
We've recently seen an issue in Firefox 37.0.1 when some people (but not all) attempt to open the application catalog.  Firefox will display the "This connection is untrusted" message.  The users will select the option of I understand
the risks.  They are presented with the button to "Add Exception".  However, when they select that, nothing happens.
These individuals are administrators on their workstation.  We've tried having them do the "Restart with add-ons disabled" as well as deleting the cert8.db and cert_override.txt files.  They still get the same result.
Then I saw this: 
https://technet.microsoft.com/en-us/library/gg682077.aspx  Firefox 15??  This document was updated in March. 
The majority of our users do not use IE as they prefer Chrome and/or Firefox.
Has anyone experienced this with Firefox?

Answer 1

Couple of notes that may be of value you to:
1.  Even if you are using an alternative browser, the security zones that you see in IE are applied at the OS level, and thus making sure said app catalog site is either in the trusted sites or intranet sites zone is required for everything from auto-sign-in
to app deployment.
2.  Chrome stopped supporting Silverlight back at the end of November.  As that's required for the AppCatalog, that's not an option for now.  Not your direct question, but something to be aware of.