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Here are some addons which help web developers a lot :

ColorZilla: There is a color on a Web page that you like, ColorZilla will find the precise code for it and allow you to paste it into your coding program.

LinkChecker: It highlights links on any Web site and tells you if the link will direct you to a live site or if it will return a 404.

Font Finder: It allows you to highlight a font you like on any site, right-click on the selection, and after choosing "Font Finder", view the full CSS text styling of the selection. You can then paste that into your own Web page.

The Web Developer extension adds a menu and a toolbar with various web developer tools.One of the greatest aspects of Firefox is the ability to install add-ons to do just about anything and everything a browser can possibility do.I have used also firefox addons.