If you update Firefox to the latest 3.1 unstable release, you will notice that Firebug is incompatible with it. Here's how to make it work.

As we all know that firebug is a great add-on for Firefox, this is available in all the respective versions and even it supports all the versions of Firefox. It has got awesome features. The same features can be utilized in IE, Opera and Safari browsers as well, check it out

Firebug is awesome but if you want to debug your pages in Opera it is no use. You might have not known that Opera now has its own javascript debugger similar to Firebug. Just look under Tools > Advanced > Developer Tools

View DOM trees, inspect computed CSS, box model dimensions, network resources and more.

Firebug is an excellent Firefox extension. With its help you can change the appearance of a web page without modifying the HTML or CSS sourcecode.

I've used Firebug in the past, but hadn't really looked at it in comparison to HttpFox and thought that with so many people saying it was "all that and more" with regards to HttpFox, I should take a second look and compare.

The web inspector in WebKit is closing the functionality gap with Firebug and bringing console logging compatibility with it.

There are a lot of exciting new things in the Web Inspector that have been added by the WebKit community over the last 9 months. Including a redesigned interface, Firebug API compatibility, JavaScript debugger, JavaScript profiler and powerful live searching. The WebKit blog has a great write-up of all the new features. Now in the nightlies builds!

I’ve always incorporated debugging variables and functions into my code, but all that ended up happening was that I had to include a bunch of functions over and over again. I’m a firm believer in optimization, so Firebug is definitely for me.

Firebug , a very useful tool