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How can I configure Firefox to use fonts that are in a custom directory?

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I have some fonts that I want to use as my defaults for Firefox, but I want to use font files that are located in Firefox's installation directory or in Dropbox rather than the system font directory.

I have some fonts that I want to use as my defaults for Firefox, but I want to use font files that are located in Firefox's installation directory or in Dropbox rather than the system font directory.

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You would have to install the fonts in the .fonts folder (~/.fonts) in your home directory if you do not want to use the global font directory (/usr/share/fonts).

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Well I want to have Firefox as a portable installation, I'm currently using Firefox Developer Edition. I would also like a solution that works on Windows as well.

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