The vertical scrollbar no longer appears in the Bookmarks sidebar. This has been verified via backout to be a regression from the check-in for bug 345711.

In that case, this is almost certainly in the wrong product (and has the wrong flags). This should be in Core, and have the milestone set to M9 and blocking1.9? requested.

Since changing the product, it is no longer obvious that it is the Firefox bookmarks sidebar that is broken.

The tree now has hidevscroll="true" still set even when content is overflowing. hidevscroll is set here: http://lxr.mozilla.org/seamonkey/source/toolkit/content/widgets/tree.xml#30 And the attribute should be removed during an overflow event: http://lxr.mozilla.org/seamonkey/source/toolkit/content/widgets/tree.xml#880 So my guess would be that the tree doesn't get the overflow event for some reason.

As a workaround for the moment, I've discovered that if you close a folder (for example the Bookmarks Toolbar Folder) and then open it again, the scrollbar reappears.

20071031_1636_firefox-3.0a9pre.en-US.win32.zip seems to be fixed with/by bug 401463

Marking fixed per my own testing and previous comment.

verified fixed while testing the Bookmarks Sidebar (and scrollbar) using: - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a9pre) Gecko/2007110104 Minefield/3.0a9pre - Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9a9pre) Gecko/2007110106 Minefield/3.0a9pre (on Fedora F7) - Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9a9pre) Gecko/2007110105 Minefield/3.0a9pre -> Verified