Archive for November, 2013

Firebug 1.13 alpha 6

Friday, November 29th, 2013 has Firebug 1.13 alpha 6

Firebug 1.13a6 fixes 8 issues
Firebug 1.13a6 is compatible with Firefox 25-28


There are just couple of minor enhancements. Again we are mostly focusing and hardworking on adopting new Firefox debugging engine and doing great progress. This work will turn into alpha releases soon (we are yet blocked by missing platform APIs).

In this version, we improved design of the search options panel (see issue 6702):

Search Options

And Firebug now supports -0 (negative zero), see issue 6631

There are other bug fixes and you can see them all.

Please post feedback in the newsgroup.


Jan ‘Honza’ Odvarko


Firebug 1.12.5

Thursday, November 21st, 2013

Firebug team released Firebug 1.12.5. This version improves a workaround that solves Firefox tab switching and Firebug activation problem (due to a platform bug). See the detailed description of related changes below.


Firebug 1.12.5b1 has also been released to update users on AMO beta channel. This version is exactly the same as 1.12.5


Firebug 1.12.5 is compatible with Firefox 23 – 26

Firebug 1.12.5 fixes 4 issues.


Script Panel Activation

Since version 1.12.4, Firebug doesn’t pause the underlying Firefox JavaScript debugger engine (JSD) when the user is switching Firefox tabs. This avoids long tab switching times since JSD.pause/unPause is broken (it’s the platform bug). This means that Firebug with active Script panel can slow down the browser even if it’s on a background Firefox tab.

The user can see related warning message on disabled Script panel and also (if the Script panel is already enabled) within the Console panel.

Console Panel Warning

Script Panel Warning

Enabling the Script panel causes a Firefox slow-down due to a platform bug. This will be fixed with the next major Firefox and Firebug versions.

If you have the Script panel disabled, the platform bug doesn’t affect your browser experience.

Start Button Icon

In order to make it easier for the user to see that there is an active Firebug instance in the background we introduced a new state for the Start Button Icon (read more about the Start button).

Firebug is active on the current tab.
Firebug is not active on the current tab.
Firebug is active on a background tab (this is the new state).

Start Button Tooltip

Start button tooltip has also been improved. You can use it to see how many Firebug instances are currently active (you’ll see the number even if Firebug is not active on the current tab).

The Screenshot shows that there are 3 active Firebugs in the browser (and the icon indicates that one of them is on the current page).

Shutdown Firebug

Finally, in order to quickly shutdown all Firebug instances at once and ensure that the underlying Firefox debugging engine (JSD) is deactivated (not slowing down the browser anymore), you can pick Clear Activation List from the Start button context menu.


Please post feedback in the newsgroup, thanks.

Jan ‘Honza’ Odvarko


Firebug 1.13 alpha 5

Friday, November 8th, 2013 has Firebug 1.13 alpha 5

Firebug 1.13a5 fixes 9 issues
Firebug 1.13a5 is compatible with Firefox 25-28


This version doesn’t introduce any new features. The entire team is now focusing and hardworking on adopting the new debugging API that shall represent the heart of the debugger in This work will be also included in alpha releases soon.


Please post feedback in the newsgroup.


Jan ‘Honza’ Odvarko