What does this mean?

I sat down at my computer and this was on the screen.  Any help on its significance?

Bob SchneiderCo-OwnerAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
That's an image of the Firefox Error Console (Ctrl-Shft-J).  No particular significance if it's not your web page.  If it is about your page, it's telling you what Firefox doesn't like about it.  If you're viewing this in Firefox, press Ctrl-Shft-J and see what comes up.  Web pages often have CSS code for more than one browser and the other browsers don't always recognize some of it.
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