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A quick google search didn't give me the answer, I only learned how to manage the Top Sites.

It might be useful to customize the Top Sites feature depending on the size of your screen; either you want less Top Sites; giving you bigger thumbnails or more sites to - well - have more available.

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up vote 4 down vote accepted

Go to about:config and change browser.newtabpage.rows and browser.newtabpage.columns

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by "changing" you mean adding? I don't have them yet. – klyonrad Jan 27 '13 at 2:11
    
They do exist on the latest nightly, and just checked 18.0.1 and they are there too. What's you Firefox version? – paa Jan 27 '13 at 12:57
    
Waterfox 16.0.1 ;) Damn it for not having an automatic update feature – klyonrad Jan 27 '13 at 15:25
    
just updated to 18.0.1. Yes - there it is. It doesn't seem to use up the borders on the right and the left side though :/ – klyonrad Jan 27 '13 at 15:31

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