This is great. I knew about the Get(SystemVersion) but I wanted to see if someone had a script for handling the decision and I since have figured it out.
The result of Get(SystemVersion) gives 3 groups of text - computer browser version
First create a test on computer if answer is not Win or Mac - unsupported
Then test on browser - if answer is not IE or Chrome or Safari - unsupported
Then test on Version - if browser is IE and version is less than 11 - unsupported
Thank you for your help!
I have just been using text on the opening layout "Firefox and phone web browsers are not fully supported..."
Then put a 'Hide oject when' condition ;
Seems to be working.