firebug vs firefox developer tools

Here are the major differences:

• Firebug has the DOM panel, native tool has no equivalent
• Firebug has the Cookies panel, native tool has no equivalent
• Firebug submenus for Net, CSS, and HTML panels have filters unavailable in the native tool
• Native tool has built-in Profiler, Firebug needs YSlow

http://blog.mozilla.org/devtools/2011/05/25/the-relationship-between-firebug-and-mozilla-developer-tools/