The following script breaks breaks the embedded Chrome and IE browser. The embedded Mozilla is okay if I Run (i.e. Cntr+F9), but it silently crashes when using debug. What can be done? Thanks

var legend=$.jfUtils.isset(() => json.config.legend.enabled, 1);

IDE supports external browsers -- exactly for this reason because embedded ones may not work in some margin cases, or you have to add some tricks to make them working, like in embedded IE case - it's often either in IE6 or IE11 emulation mode.