Firebug is an extension for Mozilla Firefox .Mainly this Extension is for Developers. It is very simple and useful extension for Testing and debugging of HTML,CSS,Java script codes .We can find errors with the help of firebug , in our HTML,DOM,CSS,Java script codes.
The new features of Firebugs are
Three main issues of previous version has fixed
Firebug no longer displays 304 Not Modified lines in NET panel
Breakpoint editor text is invisible!
Firefox crashes when trying to log XMLHTTPRequest to console
Download firebugs 1.10.2 for Firefox