On Wednesday, 16 October 2013 at 17:27:54 UTC, H. S. Teoh wrote:
some default error handler somewhere that swallows all JS errors
That would be function bound to window.onerror event. Remove it, or put breakpoint in it;
Also "use strict"; on new code. But it might be valuable to find out if it pays of putting it to use on old code (if it isn't too much warnings -> refactoring needed). One benefit, among few others, is that assignment to undeclared variable throws exception.
