[1.8 &1.7] Issue 4315: 	Firebug causes Firefox 4 to be inoperable with swfobject.js or minified code. This patch does not fix the user's problem (which I don't reproduce), but fixes another problem I found and documented in the issue. If we get a bad context, the exception causes the debugger to unhookScripts() but there is no path to hookScripts() short of restarting.
[1.8 &1.7] Issue 4315: 	Firebug causes Firefox 4 to be inoperable with swfobject.js or minified code.
This patch does not fix the user's problem (which I don't reproduce), but fixes another problem I found and documented in the issue.
If we get a bad context, the exception causes the debugger to unhookScripts() but there is no path to hookScripts() short of restarting.

http://code.google.com/p/fbug/source/detail?r=9913

firebug/tracing-console,firebug/tracing-console