Comment 197 for bug 1084

(In reply to comment #88)
> I've tried the headerScroll extension and it works well. The only "drawback"
> (or rather, a feature request) is that the scrolling should be available for
> "View->Headers->Normal" too. Right now the extension works only if "Headers" is
> set to "All". My issue with TB not having a scroll bar here is that when the
> recipient list is long and it's expanded using the "flippy triangle", the
> recipient list is also truncated to the size of the window and there's no way
> to read the recipient list or the message!

Yeah, that is bug 56825 (which should be a duplicate of or blocked by this one).
Perhaps you could contact the author of the extension, Christian Weiske[*], about that idea. Maybe if everybody here sends him a postcard, he will do it. That would be at least 61 postcards! ;)

I think it is a pretty intelligent thing to have the scrollbar whenever the headers overflow the headers pane and not only for full headers. That would fix this and bug 56825 and perhaps 9942. I don't think anybody is going to complain about that solution and you don't need any additional options.

[*] http://www.cweiske.de/misc_extensions.htm