Kinda similar problem was discussed here when using "Visual Studio Web Accessibility Checker" :
I'm new to Browsersync but it seems a really handy feature. Which edit mode do you use? The inpage editor or the forms editor? I have another problem where the edit mode isn't in sync at all. Is there any output in the screen or is it just blank?
It doesn't matter wich editor. The page is completely blank beneath the top "dropdown" part.
It seems that Visual Stuidos Browsersync feature makes editmode go blank in every recent version browser except Firefox.
Has anyone encountered this behaviour before?
Browsersync appears to mess up loading of dojo components in the affected browsers
EPiServer version 9.12, latest versions of IE, Edge and Chrome behaves the same.