Web Developer

by aerandir

27 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,835 reviews

2,082,205 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...

Awesome Screenshot Plus - Capture, Annotate & More by Diigo Inc.

Rated 4 out of 5 stars 1,252 reviews

290,804 users

Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, blur sensitive info, one-click upload to share. And more!

Ghostery by Ghostery

Rated 5 out of 5 stars 1,290 reviews

1,395,905 users

Increase your browsing privacy, protection, and speed.

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 263 reviews

323,038 users

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Web Developer by chrispederick

Rated 5 out of 5 stars 246 reviews

461,220 users

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

Flagfox by Dave G

Rated 5 out of 5 stars 664 reviews

489,463 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...

Speed Dial [FVD] - New Tab Page, Sync... by Nimbus Web

Rated 5 out of 5 stars 2,094 reviews

164,163 users

FVD Speed Dial - Speed dial button, online synchronization, new tab start page, bookmark organization, custom backgrounds, custom dials, groups, mobile apps, most-visited dials.

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 309 reviews

256,032 users

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

Nimbus Screen Capture - editable screenshots by Nimbus Web

Rated 5 out of 5 stars 289 reviews

132,585 users

1) Screen capture web pages.
2) Selected regions.
3) Whole browser windows.
Edit screenshots and save the images to either local file or Google Drive. Annotate screenshots in a very user-friendly interface with different tools. Upload and share!

Cookies Manager+ by V@no

Rated 5 out of 5 stars 67 reviews

102,896 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 170 reviews

142,097 users

View HTTP headers of a page and while browsing.

JSONView by Ben Hollis

Rated 5 out of 5 stars 165 reviews

112,390 users

View JSON documents in the browser.

HttpFox by Martin Theimer

Rated 4 out of 5 stars 168 reviews

83,932 users

An HTTP analyzer addon for Firefox

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 358 reviews

135,496 users

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

YSlow by YSlow

Rated 3 out of 5 stars 215 reviews

76,002 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.
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