To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
Working with FF3: Rated 5 out of 5 stars
To work on Firefox's appearance, close all tabs then open DOM.
(not accurate because my FF is not in English):
File > Inspect Chrome of the document > Mozilla Firefox.