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The idea is to replace standard tab mechanism with something similar to Firefox awesomebar. In toolbar, instead of tabs on the bottom/top/etc. and search feature, we will had combobox widget with edit entry inside. When click on normal area, user may type by keyboard search term or tab name. Menu will appear with tabs matching search criteria (matched will be related to tab name, shell name in tab or text on console) listed. When clicked on down button, list of tabs will appear.

Why?
1. It is similar to CSD idea. GNOME has CSD, but KDE have top panels in apps. Use empty space more rational.
2. More space on top-bottom axis.
3. Possibility to search for tabs, text in console, etc.