I discussed this on the Jitsi mailing lists and the link to that discussion is: http://lists.jitsi.org/pipermail/dev/2013-July/017864.html
At lower window sizes (width specifically), the icons in the toolbar disappear instead of pouring into an "overflow" menu. This overflow menu could simply be an arrow icon that when clicked drops down a context menu-like list of all the icons that are not currently showing.
(Issue migrated from https://trac.jitsi.org/ticket/1184)
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