Firebug break on error functionality

I was wondering when a error message pops up in Firebug, what does that disable mean? I tried to search in Firebug Docs but no luck. Ca开发者_Python百科n someone please advise? Thanks.

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When you click Disable, it stops the code from breaking at that point during future runs.
It also marks the line with a breakpoint and disables it.

Note: Extra breakpoint added for reference.