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When the title of a link is entirely in LaTeX, e.g. a question named on the front page such as this one, then there is no way to get the link menu (e.g. to copy the url) since the MathJaX menu applies to the whole link.
In any case, even if you can't click on the title, you should be able to copy the standard link from the footer menu of the question as well.
I'll mark this status-bydesign. As long as we support LaTeX in title (which is widely used) and MathJax's context menu, we can't avoid this.
In Firefox, you could turn off "Disable or replace context menus". Then both menus will appear.