right click / context menu dont work
 

i want to open the context menu with rightclick like here:

https://image.ibb.co/fqzwcq/context.jpg

but instead i get the context menu from the browser (testet with crome, firefox and edge)

https://high-devil-force.de/why/context_menu.png

i googled if i need to change anything in my browser settings but i cant find anything...