Web Development


X-Forwarded-For Spoofer

Some clients add X-Forwarded-For to HTTP requests in an attempt to help servers identify the originating IP address of a request. Some clients, however, can set X-Forwarded-For to any arbitrary value. Some servers assume X-Forwarded-For is unassail...

Not yet rated
85 users
Added October 18, 2010

utf8 characters No Restart

☞ utf8 characters is an extension that contains a list of cool characters ☆ ✪ ✰ to copy and paste into your messages ❀ on sites that use utf, like twitter or wordpress ☺ ✓

Rated 4 out of 5 stars (3)
530 users
Added October 15, 2010

Copy Frame Address

Copy the address of a frame/iframe to clipboard from context menu

Rated 5 out of 5 stars (1)
537 users
Added October 6, 2010

Print Preview Button

Adds a print preview toolbar button. After installing the extension, find the print preview button in the toolbar customization...
Print Preview in Firefox only available in Windows

Rated 5 out of 5 stars (7)
4,037 users
Added October 6, 2010

Form data generator

This Firefox's extension is designed to help brazillian programmers in websites development.
It has several commands to fill in form fields to test the validation of these fields.

Rated 2 out of 5 stars (1)
152 users
Added October 2, 2010

Pentadactyl No Restart

Firefox for Vim and Links addicts.

Rated 5 out of 5 stars (139)
2,314 users
Added October 2, 2010

Seitwert.de SEO Plugin

Das Seitwert-Plugin vereint die Funktionalität klassischer SEO-Plugins mit einem schnellen Zugang zu allen wichtigen Seitwert-Funktionen. Zu jeder Seite die Sie aufrufen, bekommen Sie automatisch wichtige Faktoren angezeigt. Neu: Blekko-Hostrank.

Rated 4 out of 5 stars (7)
1,733 users
Added October 1, 2010

Remote XUL Manager No Restart

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (36)
82,283 users
Added September 27, 2010


Display horizontal and vertical floating guides, exactly the way you use it in photoshop. Helps improving layout, placing elements in proper grids, laying out elements symmetrically and structure a design.

Rated 4 out of 5 stars (19)
4,134 users
Added September 27, 2010


Shows previous page on the left side

Rated 4 out of 5 stars (2)
14 users
Added September 24, 2010


The greatest user script engine on the Internet (a fork of Greasemonkey).

Rated 4 out of 5 stars (116)
74,144 users
Added September 21, 2010

Copy Fixer

Copy the page title and URL using Ctrl-C or Command-C.

Rated 5 out of 5 stars (12)
1,093 users
Added September 18, 2010


This Add-on is an excellent way for you to ping any page on-the-fly. If you are on a page and want to Ping it, just click on the Pingler icon in your Firefox browser and the URL of the page will be sent to Pingler and pinged automatically for you.

Rated 3 out of 5 stars (4)
438 users
Added September 16, 2010

Highlight Elements (Selenium IDE)

A plugin for Selenium-IDE to highlight elements used in the Selenese commands

Rated 4 out of 5 stars (1)
8,890 users
Added September 14, 2010


Arboreal is a Firebug extension for DOM tree visualization.

Rated 4 out of 5 stars (9)
16 users
Added September 13, 2010

Web History Repository

Do you want Firefox to be smarter? So do we. And it is easy for you to help. Submit your anonymized Web history to the Web History Repository. With your data, researchers can gain new insights; programmers can create new tools and plugins for you.

Not yet rated
28 users
Added September 8, 2010

Search IP

This plugin adds three links to Firefox's context menu that lookup the selected IP address at Project Honey Pot, Utrace, spamhaus, senderbase,...

Rated 5 out of 5 stars (2)
1,269 users
Added September 2, 2010

CDNPIC remote image uploader

Reupload an image to cdnpic.com by right clicking on an existing image.

Rated 5 out of 5 stars (1)
30 users
Added September 1, 2010


The facility to upload pictures faster than ever!

Not yet rated
21 users
Added August 31, 2010

OpenLink HTML5 WebDB-to-XMLA Bridge

Bridges the HTML5 Web SQL Database API to tabular XMLA (XML for Analysis) data sources.

Not yet rated
693 users
Added August 30, 2010