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How to increase tab and menu font size in Foxdie

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Font size of tabs and menu is about a 6 on my desktop. However, is about a 10 on my laptop with the same settings. How can I increase desktop font size?

Font size of tabs and menu is about a 6 on my desktop. However, is about a 10 on my laptop with the same settings. How can I increase desktop font size?

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You can increase the String pref layout.css.devPixelsPerPx from 1.0 to 2.0 in 0.1 steps to see what works best.
In Firefox 3.6 and later this pref is a String value parsed to a float and allows to fine tune the dimensions of all elements more precisely.

If the content on websites needs to be adjusted after making this change then you may need NoSquint.