Web Development

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Disable WebRTC No Restart

WebRTC exposes your internal network IP(s), without user interaction.

Rated 4 out of 5 stars (19)
63,631 users

MozRepl

Interactive Javascript Console for Mozilla Applications Developers

Rated 4 out of 5 stars (11)
41,341 users

Modify Headers

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.

Rated 4 out of 5 stars (71)
224,130 users

iMacros for Firefox Featured

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...

Rated 4 out of 5 stars (376)
396,036 users

Sharp Color Picker No Restart

A full featured color selector tool, to work with colors, and easily find the colors you want.

Not yet rated
1,207 users

Cookie Watcher

Cookie Watcher is a tool to watch selected cookie in a statusbar.

Rated 5 out of 5 stars (6)
1,774 users

Remote Control

Remote control the browser by executing any Javascript (e.g. forcing a page reload) from a TCP socket, e.g. from a script.

This allows you to refresh the browser from your IDE, or to automate tests.

Rated 5 out of 5 stars (5)
1,631 users

Remove All Cookies No Restart

Remove all cookies easy and quickly from Tools Menu

Rated 5 out of 5 stars (1)
2,460 users

Remote XUL Manager No Restart

Manages the Remote XUL whitelist to allow websites and local files to load XUL content.

Rated 5 out of 5 stars (34)
69,825 users

User-Agent Switcher No Restart

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (6)
18,106 users

IP Check No Restart

This simple addon will show you the IP address of the site you are currently browsing, with a link to whois.sc for each IP.

Rated 5 out of 5 stars (2)
2,475 users

Seamless Print No Restart

Enables silent/unattended/kiosk printing without showing the print dialog.
A simple click turns Seamless Print On or Off.
With Seamless Print turned On, print requests go directly to the printer using any Print options already setup.

Rated 5 out of 5 stars (4)
1,667 users

BrowserStack Local No Restart

UPDATE: This add-on is deprecated and no longer maintained, there is a newer version available at BrowserStack.

Rated 5 out of 5 stars (3)
1,892 users

JSON-formatter No Restart

Click addon's icon to quick format JSON document with tabs and new lines.

Not yet rated
2,850 users

BugzillaJS - Tweaks for Bugzilla No Restart

BugzillaJS adds a number of features to Mozilla's Bugzilla. Keyboard shortcuts, quick file box, inline image/github previews, relative timestamps, gravatars and more. (All features are optional; contains almost all features Bugzilla Tweaks has)

Rated 5 out of 5 stars (11)
1,414 users

Autofill

Autofill is a small but powerful add-on that serves one purpose: fill form fields automatically on page load. It is for people who just want a straightforward form filler without all the bells and whistles.

Rated 3 out of 5 stars (49)
19,287 users

Pearl Crescent Page Saver screenshot tool

Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.

Rated 4 out of 5 stars (77)
85,719 users

Easy Copy Paste

No more Ctrl+C / V. Fastest way to copy and paste. Copy with and without formatting! Quickly Tun On and OFF copy paste feature when you need it.

Rated 4 out of 5 stars (11)
3,729 users

Pick That Color No Restart

A simple lightweight addon for selecting any color from web pages. It copies the Hex color code of any pixel that is displayed in your browser to clipboard. Just click the color wheel button near your address bar or press 'Ctrl+Shift+z'.

Rated 5 out of 5 stars (2)
1,365 users

Yandex Wordstat Assistant No Restart

Расширение, позволяющее значительно ускорить сбор слов с помощью сервиса подбора слова Яндекс (wordstat)

Rated 5 out of 5 stars (1)
1,557 users