Just to reiterate what bz said for emphasis: it wasn't a matter of Firebug "playing ball". The choice to build afresh was made based on the direction that they

Just to reiterate what bz said for emphasis: it wasn't a matter of Firebug "playing ball". The choice to build afresh was made based on the direction that they wanted to go at the time and our own assessment of how we could get something reliable into the product. Also, Firefox 13 (which enters beta this week) has a bunch of nice improvements including remembering whether the HTML and Style panels are open. http://hacks.mozilla.org/2012/03/firefox-aurora-13-developer-tools-updates/ http://hacks.mozilla.org/2012/03/firefox-aurora-13-developer... We're iterating at a decent pace on these tools, so keep watching. The JavaScript debugger is coming to Aurora soon and it's shaping up quite nicely. The work behind that is going to be a big win for both the new debugger UI in Firefox and ultimately for Firebug as well.