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Rated 5 out of 5 stars
I meet an issues with Firebug. I turned script debugger on but after use it I forgot to turn it off.
The result is my Firefox was very slow in the following days. I can't event use gmail until turn debugger of in firebug.
It's my bad.
But it should be great if firebug can show a warn or notification message when I start Firefox with debugger turned on.