Web Development

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SPDY indicator No Restart

An indicator showing SPDY support in the address bar.

Rated 4 out of 5 stars (18)
8,468 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 5 out of 5 stars (59)
115,433 users

Monitor Master No Restart

Functionality for multiple screens and windows. Open, merge and position windows, tabs and links by means of intuitive graphical controls in your context menu's.

Rated 5 out of 5 stars (9)
1,775 users

It's All Text!

Edit textareas using an external editor, because it's all text!

Right click on a textarea, select "It's All Text!" and edit the text in the editor of your choice.

Alternatively, click on the edit buttons added for your convenience. Right click on ...

Rated 4 out of 5 stars (169)
13,712 users

CacheIt!

Quickly view or copy the URL to a cached version of any wesbite using Google, Coral CDN, or The Way-Back Machine. Allows you to access websites that have crashed or have shut down. Cacheit! can also be useful for bypassing internet filters. Enjoy. :)

Rated 5 out of 5 stars (6)
1,808 users

JS Print Setup

Client side Javascript printer settings.
This extension implements print setup from CS Javascript, similar of MeadCo's ScriptX ActiveX control for Internet Explorer.

Rated 5 out of 5 stars (18)
29,865 users

Copy HTML No Restart

Adds a 'Copy HTML' context menu item which allows you to copy the HTML for the selected content.

Rated 5 out of 5 stars (4)
2,365 users

LinkSidebar

View, search and test hyperlinks in a web page.

Perform group actions on multiple links like opening in tabs, copying link locations or testing to determine response times. Allows you to search/sort links and highlight their position on the webpage.

Rated 5 out of 5 stars (15)
1,946 users

TestWise Recorder

Recording tool to help creating automated test scripts (RWebSpec, Watir and Selenium-WebDriver) for web applications

Not yet rated
1,018 users

FireSSH

FireSSH is a free, cross-platform SSH terminal client for Mozilla Firefox. Written entirely in Javascript!

Rated 4 out of 5 stars (68)
18,821 users

Config Descriptions No Restart

Shows source comments for advanced application preferences in about:config

Rated 5 out of 5 stars (16)
2,762 users

HighlightAll

Automatically highlight and count all occurrences of the selected text with just a click (substitute for Ctrl-F with highlight option). Another click in the document removes highlighting.

Rated 4 out of 5 stars (31)
5,023 users

Color That Site!

Change the colors of web sites. With the move of some sliders, you change the foreground and background colors of a site.

Watch the video for a short introduction.

Rated 4 out of 5 stars (41)
5,309 users

Javascript Deminifier

This addon will deminify javascript before it is downloaded. This is useful when using firebug to debug a javascript application that uses javascript that has been minified.

Rated 4 out of 5 stars (14)
16,633 users

Firebug Autocompleter

Firebug command line autocomplete.

Rated 4 out of 5 stars (24)
30,156 users

Context Font

Show the font of selected text in the context menu.

Rated 4 out of 5 stars (12)
3,715 users

Launchy

Launchy will enable you to open links and mailto's with external applications...

Rated 3 out of 5 stars (71)
7,251 users

Grab Them All (screenshots of many pages)

GrabThemAll extension takes screenshot of sites specified in external file and write them as graphic file to selected directory. URL of sites to shot must be written in *.txt file and start with http[s]:// prefix, URL separated by new line sign.

Rated 4 out of 5 stars (11)
3,129 users

JSONView

View JSON documents in the browser.

Rated 5 out of 5 stars (111)
71,403 users

Awesome Screenshot Plus - Capture, Annotate & More No Restart

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!

Rated 4 out of 5 stars (845)
189,984 users