<p><a href="https://github.com/tomhughes" class="user-mention">@tomhughes</a> yes that's correct, Firefox always goes straight to the default context-menu on shift-click. (It can be prevented with some ugly hacking, I think, if someone is deliberately trying to suppress the default.) Disable on shift is mentioned in passing here as an example: <a href="https://html.spec.whatwg.org/multipage/forms.html#context-menus">https://html.spec.whatwg.org/multipage/forms.html#context-menus</a> "User agents may..."</p>

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