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How do I force Firefox to use a local stylesheet?

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In order to debug some issues with complicated nested tables, I need to be able to see all the table and cell boundaries, even if they are designed to be invisible in normal use (i.e. border=0). I would like to be able to switch this easily on and off. How do I do this in Firefox?

In order to debug some issues with complicated nested tables, I need to be able to see all the table and cell boundaries, even if they are designed to be invisible in normal use (i.e. border=0). I would like to be able to switch this easily on and off. How do I do this in Firefox?