FireCSS is an awesome and very useful add-on for Firebug. This Firebug add-on allows you to make live CSS changes on a given page, FireCSS then sends the changes to any browser open on that page.
FireCSS is activated by adding a temporary javascript tag to any page you want to edit. That javascript activates FireCSS and connects other browsers to the web service to get CSS updates.
And then every time you edit CSS in Firefox, it sends a CSS Update event to the web service which farms the updates out to any other connected browsers on that page.
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