I’ve written earlier about user helplessness regarding any javascript alert boxes which keep popping in one tab of the browser, thereby jeopardizing the whole browser window.
I just found by chance that Google Chrome indeed handles this elegantly: On the second popup for any page, it displays this neat checkbox right below the message:

This is something that Mozilla folks decided “could wait” for the past eight years?
May 4th, 2009 at 3:31 am
Hey – I just wrote a Firefox extension that lets users suppress multiple alert dialogs.
And this blog post was part of the inspiration, so thanks!
Anyhow, if you’re interested, you can get it here: http://mikeconley.ca/blog/2009/05/03/overriding-firefox%e2%80%99s-windowalert-part-4/
Cheers,
-Mike
February 1st, 2010 at 12:33 am
what then is the reason behind chrome suppressing simple alert messages – for developers to trace code flow ?
Please suggest some debugging tool that is as easy.
February 9th, 2010 at 11:58 pm
Its for non-developers to conveniently skip messages put in maliciously or mistakenly in never-ending sequences (or loops).
What debugging tool are you looking for, exactly?