Tool to Dynamically Edit CSS

I recall hearing about a tool that allows you to dynamically edit CSS when viewing a page. This is primarily useful for developers开发者_Python百科, and I'm not looking to apply those changes later.

Does this tool exist? I'm looking for something that works with either FireFox or Chrome.

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• Firefox: Firebug.
• Chrome: dev tools are built in:

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This is the firebug extension for Firefox !

http://getfirebug.com/

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Yes. You can edit css dynamically with Firebug addon for Firefox. You can do the same with the latest version of Opera (is built in) and also I imagine Chrome too.

Infact with these tools you can edit not just css but html and the rendered DOM too. Plus you can run js too.