Firebug 1.0 Beta 1

Firebug 1.0 is available as a beta version. Initially it was going to be a commercial extension, but it looks like it will be open source. Hopefully it will be maintained (and not just by one or two people), although I am not sure how it can be improved (aside from working on IE as well). Very good for debugging (JavaScript and CSS) as you can set breakpoints, view a box-model representation of any selected element, disable CSS (down to specific properties (i.e. font-size)) and more.

Get Firebug and make a donation to show your appreciation for Joe Hewitt's hard work.

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