Sometimes its amazing how slowly development can work. This bug, the lack of scrollbars for the headers panel in Thunderbird, has been open for more than three years. The fix, based on the comments, seems to be a CSS addition of less than 10 lines. The bug has 72 votes and 112 comments which should make it a fairly popular bug. Still, it’s not fixed in Thunderbird 2.0 beta 1.
Luckily, there is a great extension that does fix the problem, and with some hacking of install.rdf it seems to work in 2.0 beta 1 as well.
tags: Development - Open source