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Is there a Firefox extension that will let me simply select a visible element on a page, get a CSS selector referring specifically to that element (as the Firefox Web Developer extension already does), and the TYPE IN SOME CSS that is immediately applied to that selector?

For example:

I have a page with some yellow text. I want to change the yellow text to red.

I want to be able to simply click on the yellow text, see that it can be referenced by the long and cumbersome CSS selector

#firsthalf.foo li #crazystuff .wishfulthinking b a #badidea

and then say

color: red !important;

and see the text turn red.

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Yes, Firebug will do just that.


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