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What is the font used in firefox in Windows 8

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hi i want to know what font is used in firefox in windows 8 ? this font is very good for persian characters now i'm using windows 7 and i want to have font style like in windows 8 how can i change the settings

hi i want to know what font is used in firefox in windows 8 ? this font is very good for persian characters now i'm using windows 7 and i want to have font style like in windows 8 how can i change the settings

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Is this a font in the user interface or on web pages?

You can right-click on a web page and select "Inspect Element" to open the Inspector (Firefox/Tools > Web Developer). You can check the font used for selected text in the Font tab in the right pane of the Inspector.

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font in windows 7: Segeo UI in windows 8.1: Segeo UI Light

but i think this font is defined in windows settings that firefox uses this font

i can't solve my problem yet could you explain more