Web developer toolbars ? Special toolbar for web-developers. These toolbars usually provide one or a combination of debugging, CSS, HTML, DOM, JavaScript, and other tools which aid in web development. The toolbars are generally created by 3rd party companies, but do not effect the web browser's performance when not in use.

Here is list of popular browsers toolbars.

For Internet Explorer

Internet Explorer Developer Toolbar http://www.microsoft.com/downloads/details.aspx?familyid=E59C3964-672D-4511-BB3E-2D5E1DB91038&displaylang=en
Firebug Lite http://getfirebug.com/lite.html

For Firefox

Firebug http://getfirebug.com/
Web Developer http://chrispederick.com/work/web-developer/

For Firebug

YSlow analyzes web pages and tells you why they're slow. http://developer.yahoo.com/yslow/

For Opera

Opera developer tools http://dev.opera.com/tools/
Web Developer Toolbar http://operawiki.info/WebDevToolbar
Firebug Lite http://getfirebug.com/lite.html

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