Firebug 1.9.1 is now available for download. This is a maintenance release.what’s new in this release?
Now firebug 1.9.1 is compatible with Firefox 12.
Workaround for a crash on Mac and Linux 32 bit running Firefox 9. Due to a bug in the debugger service in Firefox 9 the Script panel is disabled in aforementioned configurations. Using Firefox 10 is recommended solution for this problem.