I’m using the thunderbird conversations add-on and am generally quite happy with it. One pain point however is that its quick reply feature has a really small text area for replying. This is especially annoying if you want to reply in-line and have to scroll to relevant parts of the e-mail.
A quick fix for this:
- Install the Stylish thunderbird add-on
- Add the following style snippet:
.quickReply .textarea.selected { height: 400px !important; }
Adjust height as preferred.