I am viewing the Demo of the change tracker in Firefox, and the OpenTip display is off. Text appears vertical. Looking at the debugger, it shows the width of that node as only 1px. When I downgraded my jquery to 3.1.1, it displayed correctly.
I know the demo code is creating a script to jquery 1.9.1, but our apps out there are using the latest jQuery, and this causes an issue only in Firefox.