Firefox Addon FireBug is one of the easiest & efficient way for web developers to edit CSS in Firefox browser. Its a tool which easily captures the fine CSS elements, allows to change the style, css & provide the instant view of the changes made. Although the changes are not permanent but helps to make important desicions regarding the different views , styles in the web pages after observing the results of the change.
This is a nice video from kristarella in which Firebug’s usage is nicely explained with a coverage of tools
