for s = 1, screen.count() do
    -- Create a promptbox for each screen
    mypromptbox[s] = awful.widget.prompt({ layout = awful.widget.layout.horizontal.leftright })
    -- Create an imagebox widget which will contains an icon indicating which layout we're using.
    -- We need one layoutbox per screen.
    mylayoutbox[s] = awful.widget.layoutbox(s)
    mylayoutbox[s]:buttons(awful.util.table.join(
                           awful.button({ }, 1, function () awful.layout.inc(layouts, 1) end),
                           awful.button({ }, 3, function () awful.layout.inc(layouts, -1) end),
                           awful.button({ }, 4, function () awful.layout.inc(layouts, 1) end),
                           awful.button({ }, 5, function () awful.layout.inc(layouts, -1) end)))
    -- Create a taglist widget
    mytaglist[s] = awful.widget.taglist(s, awful.widget.taglist.label.all, mytaglist.buttons)

    -- Create a tasklist widget
    mytasklist[s] = awful.widget.tasklist(function(c)
                                              return awful.widget.tasklist.label.currenttags(c, s)
                                          end, mytasklist.buttons)

    -- Create the wibox
    mywibox[s] = awful.wibox({ position = "top", screen = s })
    -- Add widgets to the wibox - order matters
    mywibox[s].widgets = {
        {
            mylauncher,
            mytaglist[s],
            mypromptbox[s],
            layout = awful.widget.layout.horizontal.leftright
        },
        mylayoutbox[s],
        mytextclock,
        s == 1 and mysystray or nil,
        mytasklist[s],
        layout = awful.widget.layout.horizontal.rightleft
    }

end

Вот куда здесь добавлять button на запуск браузера например