Why should you hide your email address from site visitors? Don’t you want your visitors to email you?
Well, yes you do, but many webmasters make the mistake of prominently displaying there email address on each web page only to find that they are inundated with spam.
However you cannot simply remove your email address as [...]

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.
Firebug features:
Just the way you like it
Firebug is always just a keystroke away, but it never gets in your way. You can open Firebug [...]

HTML Validator is a 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.
The extension is based on [...]

The Web Developer extension adds a menu and a toolbar to the browser with various web developer tools. It is designed for Firefox, Flock, Mozilla and Seamonkey, and will run on any platform that these browsers support including Windows, Mac OS X and Linux.
It is created by Chris Pederick in order to handle dozens of [...]

There are many false benefits of XHTML promoted on the Web. Let’s clear up some of them at a glance:

XHTML does not promote separation of content and presentation any more than HTML does. XHTML has all of the same elements and attributes (including presentational ones) that HTML has, and it doesn’t offer any additional CSS [...]