Development Blog

Firebug 2.0 alpha 1 has Firebug 2.0 alpha 1

Firebug 2.0a1 fixes 174 issues
Firebug 2.0a1 is compatible with Firefox 30-31


Update: an issue with Firefox 30 compatibility fixed


This alpha represents the first public release that is based on new Firefox debugging engine (also known as JSD2). Firebug team has been working hard to adopt this new API and has also done great job with polishing Firebug UI that is now matching the Australis theme introduced in Firefox 29.

This version introduces many changes and we decided to bump up the version number to 2 (!) starting from alpha 1. Firebug users having Firebug 1.13 alpha installed will be automatically updated (assuming they are using Firefox 30+).


Check out the following screenshot showing the basic Firebug 2 UI



Firebug refactoring touched mainly the Script panel, which represents the heart of debugging with Firebug. Some other panels changed too since they are integrated with the Script panel through e.g. the Break On … feature.


There are plenty of bug fixes (also because we removed the old and buggy JSD1 debugging engine) and also many new features. You can check out all fixed issues. For instance, one of the most visible thing is probably that the Script panel supports JavaScript syntax highlighting.



Syntax coloring is also there if you edit HTML as a free text by clicking on the Edit button in the toolbar. CSS source edit is also supporting it.



There are other new things and we will be explaining them in following posts on this blog. So, stay tuned!


This is the first alpha, but we believe that Firebug 2 is already in great shape. We spent time also on improving our automated testing framework and we wrote new tests that cover more Firebug features. Still, feedback from you is valuable. Let us know how this brand new Firebug version works for you, so we can switch to beta phase soon and consequently do a final release!


So, give it a try and install Firebug 2 alpha 1


Please post feedback in the newsgroup.


Jan ‘Honza’ Odvarko


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