Web Development

by ace999

12 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...

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 245 reviews

367,357 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 213 reviews

538,268 users

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

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 300 reviews

242,551 users

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

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 332 reviews

143,812 users

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

Image Zoom by Jason Adams

Rated 4 out of 5 stars 329 reviews

165,758 users

Adds zoom and rotation functionality for images...

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

ShowIP by ShowIP Dev Team

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Experimental

Rated 3 out of 5 stars 284 reviews

69,846 users

Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.

Dust-Me Selectors by brothercake

Rated 4 out of 5 stars 75 reviews

15,665 users

Dust-Me Selectors is development tool to remove unused CSS selectors.

DNS Cache by djungowski

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Experimental

Rated 4 out of 5 stars 26 reviews

2,393 users

Allows you to disable and enable or manually flush the DNS Cache of Firefox (Notice: This addon is no longer maintained. If you'd like to update it for newer Firefox versions check out the Github repo: https://github.com/djungowski/ff-dnscache)

PageDiff by Khadir Abdul

Rated 4 out of 5 stars 15 reviews

1,645 users

Pagediff is a simple page compare application. It helps web developers and designers to see HTML-code(text) differences between web pages...
One can visit my site to download new version(new versions before release)

Library Detector by pbakaus

Rated 4 out of 5 stars 27 reviews

1,057 users

Detects what javascript libraries are being used on the current page and displays the result as icons with detailed tooltips in the statusbar.

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