There is a way to get MathJax to not use its contextual menu (and use the browser's instead). On a page that has typeset equations, first enter
in the URL location bar, or use your browser's developer console to type in the command (minus the
Now right-click (or control-click) on any typeset equation to get MathJax's contextual menu. In the
Math Settings menu there should now be a
Contextual Menu sub-menu. This lets you select
Browser will mean MathJax won't put up its own contextual menu but will pass through to the browser's contextual menu. That will allow you to access the menu for opening a link in a new tab, etc., that you are looking for.
Note that this menu setting will be stored in a cookie, so it will be remembered and you won't have to set it every time.
If you do this and still want access to the MathJax menu, just ALT-click or OPTION-click (that's a left-click not a right-click) on an equation and you will get the MathJax contextual menu again. You can set the
Contextual Menu value back to
MathJax to get the usual behavior from MathJax, or you can leave it as the browser menu and use ALT-click to get the MathJax menu.