When I refresh my page with firebug loaded, it pauses in Firebug with the following screen shown :

What is causing this, as it will not allow me to interact further with my site until I close Firebug? Is there a bug in my code?
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Looks like you have a breakpoint set on that line or possibly an error and break on all errors is turned on.
Go to breakpoints tab and remove all the break points and also set break on all errors to off.