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How do I highlight specific text in an email?

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How can I color highlight specific text in an email I am writing?

How can I color highlight specific text in an email I am writing?

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There is an addon for that. It says it works with up to version 31 but it is working fine for me on version 45.6. Granted I have had it installed for quite a while. You might give it a try. https://addons.mozilla.org/en-US/thunderbird/addon/highlighter-222207/?src=search