Should beep only for front-most tab

[hugojosefson]

It would be nice if it would beep only when the tab is the front-most tab, in other words, when I'm actively using the reloading tab.

For example, I have a legacy webmail system on autorefresh so it doesn't log me out for inactivity, and only want it to warn me audibly about refresh when I'm actively using it. For example when composing an email.