Comment 20 for bug 691380

Something along the lines of this bug might be especially interesting /
effective in combination with something along this one:

Bug 526221 - Pressing Enter after quicksearch filter terms should do global search (combine the best of quick filters and "Search all messages")

Iow, space-efficient users that prefer cleaner UI could
a) remove global search box from toolbar (currently possible using toolbar
customization)
b) add new quick search box to toolbar (this bug 570815)
c) use new quick search box to start global searches when necessary (bug
526221)