Did you test it on our
demo page? Could you repeat the same there?
This link has a very simple JavaScript in background. Make sure you have installed the add-on properly and it doesn't give any JavaScript errors in Errors console.
But of course, first of all, test it on our demo page and report us if there's the same problem.
(We didn't say we don't like Safari. Browser is not the thing we may like or not like, in general. We may like smells, colors, feelings, not a software. And - this option SHOULD work in any browser).