Firebug version 1.3 have just been released with more than 50 bug fixes and lots of improvements and new features including :
- FBTrace service (for internal Firebug debugging).
- TraceConsole (for internal Firebug debugging)
- Script panel implemented with as viewport on source to improve performance on large JS files
- Find debuggers by scope chain analysis rather than jsContext
- scope chain shows in watches panel (from contribution by kpdecker)
- Reimplement console/command line to reduce chance of console undefined
- DOM properties alphabetical
- Reimplement all response views with nsITraceableChannel
- Centralize handlers for http-on-modify-request in firebug-http-observer component
- Net panel timing improvements: more categories in timing.
- Add TraceConsole to aid debugging Firebug.
- FBTrace panel removed from X versions (TraceConsole instead)
- new option DBG_SPY for spy.js
- firebug-service tracing to traceConsole
Rob Campbell posted on his blog that
this version will not be compatible with Firefox 3.1 (Shiretoko) and up. For that youll need a Firebug 1.4 alpha, soon to be dubbed beta available on getfirebug.com’s releases directory


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