Firebug team released Firebug 1.12.4. Another maintenance release fixing performance problem when switching Firefox tabs.
Firebug 1.12.4b1 has also been released to update users on AMO beta channel. This version is exactly the same as 1.12.4
Firebug 1.12.4 is compatible with Firefox 23 – 26
Firebug 1.12.4 fixes 1 issue.
This version introduces a workaround that solves Firefox tab switching and Firebug activation problem (see a platform bug). As a temporary measure, Firebug no longer pauses the debugger when switching tabs. This avoids long tab switching times (see issue 6086 for more details).
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Jan ‘Honza’ Odvarko