web developer tool

by xijieqjx

30 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,793 reviews

2,285,369 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 959 reviews

1,273,056 users

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

iMacros for Firefox by iMacros

Rated 4 out of 5 stars 382 reviews

437,409 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

567,444 users

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

FoxyProxy Standard by Eric H. Jung, groeg, others

Rated 4 out of 5 stars 343 reviews

295,956 users

FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.

Flagfox by Dave G

Rated 5 out of 5 stars 635 reviews

611,590 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...

EPUBReader by epubreader

Rated 5 out of 5 stars 164 reviews

444,177 users

With EPUBReader you can read ePub files just in Firefox. No additional software needed!

Evernote Web Clipper by Evernote

Rated 2 out of 5 stars 809 reviews

410,452 users

Use the Evernote Web Clipper to save things you see on the web into your Evernote account.

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 305 reviews

302,091 users

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

Tamper Data by Adam Judson

Rated 4 out of 5 stars 132 reviews

115,714 users

Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...

Xmarks Sync by Xmarks Inc.

Rated 4 out of 5 stars 2,516 reviews

318,032 users

Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!

FireGestures by Gomita

Rated 4 out of 5 stars 877 reviews

386,376 users

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

Session Manager by Michael Kraft

Rated 4 out of 5 stars 567 reviews

286,014 users

Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 339 reviews

157,217 users

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

Cookies Manager+ by V@no

Rated 4 out of 5 stars 74 reviews

110,456 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.
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