must

by barlog

17 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,773 reviews

2,247,488 users

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 953 reviews

1,204,984 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

NoScript Security Suite by Giorgio Maone

Rated 5 out of 5 stars 1,488 reviews

2,076,997 users

The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

Tab Mix Plus by onemen, Gary Reyes

Rated 4 out of 5 stars 2,514 reviews

883,735 users

Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager.

Web Developer by chrispederick

Rated 5 out of 5 stars 213 reviews

538,268 users

The Web Developer extension adds various web developer tools to the browser.

FireGestures by Gomita

Rated 4 out of 5 stars 867 reviews

383,613 users

A customizable mouse gestures extension which enables to execute various commands and user scripts with six types of gestures.

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 155 reviews

168,076 users

View HTTP headers of a page and while browsing.

YSlow by YSlow

Rated 3 out of 5 stars 192 reviews

102,939 users

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
http://yslow.org is the official open source website.

Silvermel by ShareBird

Rated 5 out of 5 stars 577 reviews

53,474 users

A Creamy Silvery Experience

Gmail Manager by Todd Long

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Experimental

Rated 4 out of 5 stars 1,341 reviews

117,575 users

The original Gmail notifier for multiple accounts. Allows you to receive new mail notifications along with viewing account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.

Firefinder for Firebug by Robert Nyman

Rated 3 out of 5 stars 28 reviews

22,580 users

Finds HTML elements matching chosen CSS selector(s) or XPath expression

Yet Another Smooth Scrolling by kataho.

Rated 4 out of 5 stars 368 reviews

25,458 users

Extends smooth scroll more tweakable. By keyboard scroll also supported.

Server Spy by Christophe Jacquet

Rated 4 out of 5 stars 16 reviews

6,990 users

Server Spy indicates what brand of HTTP server (e.g. Apache, IIS, etc.) runs on the visited sites.

MacOSX Theme by promatik

Rated 4 out of 5 stars 104 reviews

3,024 users

MacOSX theme for Firefox 3.6

Smart Bookmarks Bar by Remy Juteau

Rated 4 out of 5 stars 486 reviews

4,404 users

Note from Mozilla: This add-on has been discontinued. Try Roomy Bookmarks Toolbar instead.
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