MDN’s new design is in Beta! A sneak peek: https://blog.mozilla.org/opendesign/mdns-new-design-beta/

Edit CSS filters

The filter editor is new in Firefox 40.

Starting in Firefox 40, filter properties in the Rules view get a circular gray and white swatch next to them:

Clicking the swatch opens a filter editor:

You can add, remove, and edit filters, and drag them to change the order in which they are applied:

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