用他来调试javascript绝对好使。
主页:
http://getfirebug.com/google论坛
http://groups.google.com/group/firebugFirebug integrates with Firefox to put a wealth of development tools at
your fingertips while you browse. You can edit, debug, and monitor CSS,
HTML, and JavaScript live in any web page.
Firebug
is always just a keystroke away, but it never gets in your way. You can
open Firebug in a separate window, or as a bar at the bottom of your
browser. Firebug also gives you fine-grained control over which
websites you want to enable it for.
Learn more
Firebug
makes it simple to find HTML elements buried deep in the page. Once
you've found what you're looking for, Firebug gives you a wealth of
information, and lets you edit the HTML live.
Learn more
Firebug's
CSS tabs tell you everything you need to know about the styles in your
web pages, and if you don't like what it's telling you, you can make
changes and see them take effect instantly.
Learn more
When
your CSS boxes aren't lining up correctly it can be difficult to
understand why. Let Firebug be your eyes and it will measure and
illustrate all the offsets, margins, borders, padding, and sizes for
you.
Learn more
Your
pages are taking a long time to load, but why? Did you go crazy and
write too much JavaScript? Did you forget to compress your images? Are
your ad partner's servers taking a siesta? Firebug breaks it all down
for you file-by-file.
Learn more
Firebug
includes a powerful JavaScript debugger that lets you pause execution
at any time and have look at the state of the world. If your code is a
little sluggish, use the JavaScript profiler to measure performance and
find bottlenecks fast.
Learn more
When
things go wrong, Firebug lets you know immediately and gives you
detailed and useful information about errors in JavaScript, CSS, and
XML.
Learn more
The
Document Object Model is a great big hierarchy of objects and functions
just waiting to be tickled by JavaScript. Firebug helps you find DOM
objects quickly and then edit them on the fly.
Learn more
The
command line is one of the oldest tools in the programming toolbox.
Firebug gives you a good ol' fashioned command line for JavaScript
complete with very modern amenities.
Learn more
Having
a fancy JavaScript debugger is great, but sometimes the fastest way to
find bugs is just to dump as much information to the console as you
can. Firebug gives you a set of powerful logging functions that help
you get answers fast.
Learn more
关于javascript开发，这里还有一个不错的开发工具，有安装版本和eclipse插件。你不妨下载试试
主页地址:
http://www.aptana.com/下载安装版本:
http://www.web20.com/downloads/current/Windows/VM/Aptana_IDE_Setup.exeEclipse插件下载:
http://www.aptana.com/docs/index.php/Plugging_Aptana_into_an_existing_Eclipse_configuration