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How can I keep my Font Sizes & Font Colors separate from Email & Chat?

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How can I keep my Font Size & Font Colors separate from my emails & chat?

For e.g.

Email: Regular size of font with black font.

Chat: Bigger Size of Font with a darker red font.

I am using a Mac.

How can I keep my Font Size & Font Colors separate from my emails & chat? For e.g. Email: Regular size of font with black font. Chat: Bigger Size of Font with a darker red font. I am using a Mac.

All Replies (3)

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You might find something in add-ons. https://addons.mozilla.org/en-US/thunderbird/

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I was unable find what I am looking for.

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Your font sizes, colours etc. are stored in a CSS file called userChrome.css. If you know how to edit CSS code you may be able to achieve what you want -- I don't know if there are separate settings in that file for chat and regular email. There's an add-on called GlobalChrome that might be of use, it provides a 'custom' file which I assume is editable.