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Add extra features and styles to make Thunderbird your own.
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CustomCSS 1.3
ruma Grant
Allow the user to configure custom CSS that will be added to messages when edited
(new, reply and forward). The custom CSS will be added to a newly created <style>
element in the email's head.
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added to all email messages (including replies and forwards) when they
are "composed".
Each time an email is opened in a compose window (write, reply, forward),
the custom CSS will be added to a newly created <style> element in the
email's head. If the head already contains a <style> element that was
added by this extension, it is replaced.