I always use firebug in firefox to check my web pages while developing my applications. I became use to of that. So I thought there must be some tool for IE also. So I googled on that and I came to know that IE Developer Toolbar is the tool that I works like firebug.
Download link : here
Same way I have searched Tools that work like Firebug on Crome & Safari. I have found that Web Inspector can help me to do so.
The Web Inspector allows you to view the page source, live DOM hierarchy, script debugging, profiling and more!
• Safari — Enable the Develop menu option in the Advanced preferences. Use the optional toolbar button, Develop menu or Inspect Element context menu to access to Web Inspector.
• Google Chrome — Enabled by default, use the Inspect Element context menu to access to Web Inspector.
For download & more info : here