Highlight text when composing a message on Thunderbird / Seamonkey
This addon is an attempt to fill a basic feature you can find in most email clients: Highlighting text when composing a message. This is particularly useful, when replying, to highlight part of the message you are answering to.
The original addon can be downloaded here: https://addons.thunderbird.net/en-US/thunderbird/addon/highlighter-222207/