Add emoji for custom font display settings

[brucelu98]

Please consider adding 'Emoji' as a font flag to allow users to select a custom emoji font for displaying websites.

Custom per-language font display can currently be selected in GUI via 'Preferences > General > Language and Appearance > Fonts > Advanced > Fonts for…' or through language flags in about:config. What I want to do is add an option for emoji specifically. Custom modification of the UI may be required as there isn't a serif/sans-serif/monospace distinction for the characters.

At the very least we currently have the choice between colour and B/W emoji in Noto, in addition to other system default fonts. As someone who uses the custom font override, I'd like to exert a greater amount of control over emoji display. Thank you.

[Jon]

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