Favour­ite FF add-ons

Col­orZ­illa
URL: homepage | @addons.mozilla.org
With Col­orZ­illa you can get a color read­ing from any point in your browser, quickly adjust this color and paste it into another pro­gram. You can Zoom the page you are view­ing and meas­ure dis­tances between any two points on the page. The built-in palette browser allows choos­ing col­ors from pre-defined color sets and sav­ing the most used col­ors in cus­tom palettes. DOM spy­ing fea­tures allow get­ting vari­ous inform­a­tion about DOM ele­ments quickly and eas­ily. And there’s more…

Down­load Status­bar
URL: homepage | @addons.mozilla.org
View and man­age down­loads from a tidy status­bar — without the down­load win­dow get­ting in the way of your web browsing.

Fire­bug
URL: homepage | @addons.mozilla.org
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…

Fire­Query
URL: homepage | @addons.mozilla.org
Fire­Query is a col­lec­tion of Fire­bug enhance­ments for jQuery.

Flag­fox
URL: homepage | @addons.mozilla.org
Flag­fox is an exten­sion for Moz­illa Fire­fox that shows a flag icon, either in the status bar or in the address bar, indic­at­ing the cur­rent website’s server loc­a­tion. It uses rel­at­ively little resources, and works by access­ing an IP address data­base con­tained within the exten­sion rather than rely­ing on top-level-domain roots like “.com” or “.uk”. Click­ing the icon loads Geotool, which provides a map of the loc­a­tion as well as more inform­a­tion such as the ISP and city. The con­text menu also provides quick access to inform­a­tion about the coun­try of ori­gin, as well as the abil­ity to lookup the site’s regis­trant via Whois. Since Flag­fox 3.3 it is also pos­sible to add a cus­tom lookup to the con­text menu.

GMarks
URL: @addons.mozilla.org
GMarks helps you sync & man­age your book­marks with Google Bookmarks…

HTML Val­id­ator
URL: homepage | @addons.mozilla.org
Moz­illa exten­sion that adds HTML val­id­a­tion inside Fire­fox and Moz­illa. The num­ber of errors of a HTML page is seen on the form of an icon in the status bar when brows­ing. The details of the errors are seen when look­ing the HTML source of the page.

Http­Fox
URL: homepage | @addons.mozilla.org
Addon for Moz­illa based browsers (Fire­fox, Flock, …) that mon­it­ors and ana­lyzes all incom­ing and out­go­ing HTTP traffic between the browser and the web servers.

Lib­rary Detector
URL: homepage | @addons.mozilla.org
Detects what javas­cript lib­rar­ies are being used on the cur­rent page and dis­plays the res­ult as icons with detailed tool­tips in the statusbar.

Loc­a­tion­bar²
URL: homepage | @addons.mozilla.org
* Puts emphasis on the domain to reduce spoof­ing risk
* Link­i­fies URL seg­ments (press Ctrl, Meta, Shift or Alt)
* More URL format­ting options configurable

Meas­ureIt
URL: homepage | @addons.mozilla.org
Draw a ruler across any webpage to check the width, height, or align­ment of page ele­ments in pixels.

Tab Mix Plus
URL: homepage | @addons.mozilla.org
Tab Mix Plus enhances Firefox’s tab brows­ing cap­ab­il­it­ies. It includes such fea­tures as duplic­at­ing tabs, con­trolling tab focus, tab click­ing options, undo closed tabs and win­dows, plus much more. It also includes a full-featured ses­sion manager.

TrashMail.net
URL: homepage | @addons.mozilla.org
Cre­ate free dis­pos­able email addresses and paste them dir­ectly in forms. This helps to pro­tect you from spam mails and could be use­ful when sub­scrib­ing to for­ums or newsletters…

View Source Chart
URL: homepage | @addons.mozilla.org
View source in color-coded chart

Web Developer
URL: homepage | @addons.mozilla.org
Adds a menu and a tool­bar to the browser with vari­ous web developer tools. It is designed for Fire­fox, Flock and Sea­mon­key, and will run on any plat­form that these browsers sup­port includ­ing Win­dows, Mac OS X and Linux.