My Favorite Add-ons


90 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,792 reviews

2,211,735 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...

iMacros for Firefox by iMacros

Rated 4 out of 5 stars 382 reviews

436,229 users

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...

Web Developer by chrispederick

Rated 5 out of 5 stars 217 reviews

557,677 users

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

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 305 reviews

296,008 users

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

FireFTP by Mime Čuvalo

Rated 4 out of 5 stars 934 reviews

555,195 users

FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.

Check out my new project, FireSSH!

Flagfox by Dave G

Rated 5 out of 5 stars 635 reviews

606,043 users

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

BlockSite by s.r.o.

Rated 3 out of 5 stars 508 reviews

213,595 users

BlockSite is an extension, which automagically blocks websites of your choice. Additionally, this extension will disable all hyperlinks to these websites, by just displaying the link text without the clicking functionality.

United States English Spellchecker by jooliaan

Rated 3 out of 5 stars 165 reviews

494,874 users

United States English Spellchecker for Firefox, Thunderbird and SeaMonkey by Kevin Atkinson and Geoff Kuenning.

To enable, right-click in a multi-line text box, select "Languages", then "English (United States)".

Open With Photoshop by Baris Derin

Rated 5 out of 5 stars 47 reviews

23,094 users

Open With Photoshop is a new companion for web and graphic designers to open up any web image with Adobe Photoshop via a single and quick mouse click.

Cookies Manager+ by V@no

Rated 4 out of 5 stars 74 reviews

109,240 users

Cookies manager to view, edit and create new cookies. It also shows extra information about cookies, allows edit multiple cookies at once and backup/restore them.

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 157 reviews

169,414 users

View HTTP headers of a page and while browsing.

Thumbnail Zoom Plus by David Adler

Rated 4 out of 5 stars 303 reviews

129,593 users

Shows full image when you hover over a thumbnail. Works with Amazon, Baidu Images, Bing Images, Facebook, Flickr, Google+, Google Images, IMDb, LinkedIn, Netflix, Pinterest, Reddit, Twitter, Yandex, YouTube, Wikipedia, Yahoo Images, & many more.

JavaScript Deobfuscator by Wladimir Palant

Rated 5 out of 5 stars 20 reviews

56,781 users

This add-on shows you what JavaScript code runs on a web page, even if it is obfuscated and generated on the fly. Simply open JavaScript Deobfuscator from the Web Developer menu and watch the scripts being compiled/executed.

Modify Headers by Gareth Hunt

Rated 4 out of 5 stars 72 reviews

140,348 users

Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.

YSlow by YSlow

Rated 3 out of 5 stars 195 reviews

98,243 users

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