With xulrunner 2 and later, the first buffer in any given window is missing a scrollbar, though the
content is long enough to require one.

For a workaround, see:

http://conkeror.org/UpstreamBugs#missingscrollbarinfirstbufferofwindow.28xulrunner.3E.3D2.29

Created test app, and created bugzilla report:

https://bugzilla.mozilla.org/show_bug.cgi?id=656517

This bug has also been reported in Debian:

http://bugs.debian.org/632310

Interestingly there are some difference to what I read here and in the bugzilla report: Accordung to the
bug submitter xulrunner 1.9.1 is affected, too.

Probably a followup error, but possibly also another issue: "Searching the buffer (while otherwise
working, finding results, and highlighting them) does not scroll the buffer to the position of the
current match" don't work in the first buffer either.

pushed a workaround/fix

We learned that the missing scrollbars bug only affects content-primary browsers, so the workaround is to
create all browsers as type 'content', then change to 'content-primary' after a timeout.