few years ago, these kinds of tools were few and far between. For instance,
it is a sobering thought to realize that the Firebug plugin didn’t even
exist until as late as 2006! At the time, it was something of a revelation
to be able to inspect the inner workings of your code without resorting to
alert() dialogs. Nowadays, every major browser
expect the same kind of toolset that developers of C, Java, Python, PHP,
Perl, and other languages have enjoyed for years.