A very few people know of what developer tools are (or firebug in case of firefox). Well, developer tools are some handy tools that are used in web development, as their name suggests. These tools give a decent way to check out not only the HTML css but even the java script, cookies and lot many things of about web page.
How to get them?
If you are on firefox you can install the addon firebug and just press F12 and you can see them. Chrome users can just press F12 and see it. These are also available on safari, opera and internet explorer and you can search them on Google.
Like firebug, Firefox has got another very useful add on namely firecookie. It does a wonderful job by providing us with the details about the all the various cookies that are set by different sites on your browsers. A great tool for those who are security concerned and learning to hack.