I sometimes get people complaining to me that CRM doesn’t work in Firefox. What i usually ask them when I hear this if they are running Mac, which of course is the reason why it isn’t working. 

The simple fact is that Firefox isn’t supported for Mac. The only supported browser for Mac OS X is Safari. And Safari isn’t supported for PC.
Below is a simple matrix showing the support matrix for the browsers (for CRM 2016).
Windows 7
Windows 8/8.1
Windows 10
Mac OS X
IPad
Google Nexus 10 Tablet
IE 10
IE 11
Edge
Firefox
Chrome
Safari
Green = Supported, Red = Not supported, Grey = Not applicable
However, do note that there is a difference between “not working” and “not supported”. The latter just means that you can’t open a support case with Microsoft and complain that CRM looks weird in some of the non supported combinations described above.

So why is this? Are Microsoft just lazy? No, Just like everyone else, they have a limited amount of time, money and resources. So, they can’t test all possible combinations unless the price of Dynamics CRM were to go through the roof, and I think we all agree that we prefer it not to.

Do refer to the official documentation from Microsoft on what is supported for more detailed information.

Gustaf Westerlund
MVP, Founder and CTO at CRM-konsulterna AB
www.crmkonsulterna.se