Let me first of all compliment and thank you for this system. It’s easy to install and even easier and clear to use. Great job!
Then: I’m a Firefox (56.0.2 64bit) user in which I’m getting the following error (console) when clicking on a menu item: Error: Permission denied to access property “apply”. The error occurs in https://www.opolo.nl/ip/assets/core/js/dependencies.min.js and also shows on your website when I try to open one of the two submenus (support or community) so I guess it uses the same code.
In the meanwhile I’m using Chrome in which everything seems to work fine, but maybe you can look into this for a future release.
Again: great job!