How to allow pop-ups from local files (files: /// addresses) in Firefox 5?

Question

I created the HTML file on my local machine, which I open with the address file:/// . It includes JavaScript, which opens new browser windows using window.open() .

When I view this page in Firefox 5, a popup blocker blocks a new window. I cannot override this behavior; clicking the Preferences pop-up blocker displays the “Allow pop-ups for” menu item that has no effect.

How to allow popups for file:/// addresses in Firefox 5?

Answer 1

Add <file> to the allowed list in accordance with Settings / Options → Content → Block pop-ups ... Exceptions.

edit: This doesn't work anymore, see comments