/usr/share/fbpanel/default is in fbpanel 6.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## fbpanel configuration file         ##
########################################
# DESCRIPTION
# Configuration file consists of mandatory 'Global' block that MUST come first,
# and optionally one or more 'Plugin' block.
# Lines having '#' as first non-blank char or blank lines are ignored
# Keywords are not case-sensitive
# Values are case-sensitive
# Value of variable is a text from first non-blank char after '='
# till the last non-blank char. '#' is NOT treated as coment in this context
# 'Global' block describes global parameters like position, size and
# some NETWM settings
# Global {
#     # screen edge
#     # legal values are: left, right, top, bottom
#     edge = bottom
#     # allignment of a panel
#     # legal values are: left, right, center
#     allign = left
#     # length of margin (in pixels)
#     # legal values are numbers
#     margin = 0
#     # widthtype specifies how panel width is calculated
#     # legal values are: request, pixel, percent
#     #   request - follow widgets' size requests. can shrink or grow dynamically
#     #   pixel   - occupy fixed number of pixels, then 'width' variable holds a number
#     #   percent - be 'width' precent of an edge.
#     widthType = percent
#     # numerical value of width (not applicable for 'request' widthtype)
#     # legal values are numbers
#     width = 80
#     # heighttype specifies how panel height is calculated
#     # legal values are: pixel
#     #   pixel   - ocupy fixed number of pixels, then 'height' variable holds a number
#     heightType = pixel
#     # numerical value of height (if applicable)
#     # legal values are numbers
#     height = 28
#     # Identify panel window type as dock
#     # legal values are boolean
#     setDockType = true
#     # Reserve panel's space so that it will not be covered by maximazied windows
#     # legal values are boolean
#     # setPartialStrut = true
#     # Transparency stuff:
#     # tintColor is a color to composite on root background given as #RRGGBB or as name
#     # alpha is transparency of the tint color.
#     # transparent = true
#     # tintColor = #FFFFFF
#         or
#     # tintColor = white
#     # alpha = 127
#     # Autohide
#     # autoHide = false
#     # heightWhenHidden = 2
# }
# 'Plugin' block specifies a plugin to load. It has same syntax for both
# builtin and external plugins.
# First parameter is 'type'. It's mandatory and must come first
# Legal values are plugin names. Names of builtin plugins are:
# separator   - visual separator
# wincmd      - 'show desktop' button
# taskbar     - lists all opened windows (tasks)
# launchbar   - bar with launch button
# image       - just shows an image
# dclock      - digital clock
# space       - just seize space
# pager       - thumbnailed view of the desktop
# tray        - tray for XEMBED icons (aka docklets)
# expand - specifies if plugin can accomodate extra space or not [optional]
# padding - extra padding around plugin  [optional]
# config {} - block of plugin's private configuration.
#             This part is plugin  dependant
#
# Plugin {
#     type = wincmd
#     config {
#         image = ~/.fbpanel/images/Desktop2.png
#         tooltip = Left click to iconify all windows. Middle click to shade them.
#     }
# }
Global {
    edge = bottom
    allign = center
    margin = 0
    widthtype = percent
    width = 86
    height = 24
    transparent = true
    tintcolor = #ffffff
    alpha = 28
    setdocktype = true
    setpartialstrut = true
    autohide = false
    heightWhenHidden = 2
    roundcorners = true
    roundcornersradius = 7
    layer = none
    MaxElemHeight = 32
}
Plugin {
    type = space
    config {
        size = 2
    }
}
Plugin {
    type = menu
    config {
        IconSize = 22
        #icon = start-here
        # Use a nice Debian logo for the menu list ;-)
        image = /usr/share/pixmaps/debian-logo.png
        systemmenu {
        }
        separator {
        }
	menu {  
	    name = Computer
	    icon = computer
            
	    item {
		name = Terminal
		icon = terminal
		action = x-terminal
	    }
            item {
                name = Lock Display
                icon = gnome-lockscreen
                action = slock
            }
            separator {
            }
            item {
                name = Reboot
                icon = gnome-session-reboot
                action = sudo reboot
            }
            item {
                name = Shutdown
                icon = gnome-session-halt
                action = sudo shutdown -h now
            }
            item {
                name = logout
                icon = gnome-session-logout
                action = /usr/lib/fbpanel/fbpanel/xlogout
            }
        }
    }
}
Plugin {
    type = space
    config {
        size = 15
    }
}
Plugin {
    type = launchbar
    config {
        button {
            icon = file-manager
            tooltip = File Manager
            action = x-file-manager
        }
        button {
            icon = terminal
            tooltip = Terminal
            action = x-terminal
        }
	button {
            icon = web-browser
            tooltip = Web Browser
            action = x-www-browser
    	}
    }
}
Plugin {
    type = space
    config {
        size = 15
    }
}
Plugin {
    type = wincmd
    config {
        icon = gnome-fs-desktop
        tooltip = Left click to iconify all windows. Middle click to shade them.
    }
}
Plugin {
    type = space
    config {
        size = 15
    }
}
Plugin {
    type = taskbar
    expand = true
    config {
        ShowIconified = true
        ShowMapped    = true
        ShowAllDesks  = false
        tooltips = true
        IconsOnly = false
        MaxTaskWidth = 150
    }
}
Plugin {
    type = space
	config {
	   size = 15
	}
}
Plugin {
    type = pager
    config {
        showwallpaper = true
    }
}
Plugin {
    type = space
    config {
        size = 10
    }
}
Plugin {
    type = mem
    expand = false
    padding = 2
    config {
        ShowSwap = false
    }
}
Plugin {
    type = cpu
    config {
        Color = green
    }
}
Plugin {
    type = net
    expand = false
    padding = 0
    config {
        #interface = ppp0
        interface = eth0
        # set connection limits to make traffic graph more accurate
        TxLimit = 20
        RxLimit = 190
        TxColor = violet
        RxColor = blue
    }
}
Plugin {
    type = space
    config {
        size = 10
    }
}
plugin {
    type = volume
}
#plugin {
#    type = battery
#}
Plugin {
    type = tray
}
Plugin {
    type = space
    config {
        size = 10
    }
}
# Digital Clock
Plugin {
    type = dclock
    config {
        ShowSeconds = false
        HoursView = 24
        TooltipFmt = %A %x
        #Action = xmessage Please define some command &
    }
}
# Text Clock
# ClockFmt: (string) Clock format string.  May contain strftime conversion
#           specifications and Pango markup information.
# TooltipFmt: (string) Tooltip format string.
# Action: (string) Shell command to execute when clock is clicked.
# ShowCalendar: (boolean) Show a GTK calendar widget when the clock is
#               clicked.  Only valid if Action is unset.
# ShowTooltip: (boolean) Show tooltip for clock.
#Plugin {
#    type = tclock
#    config {
#        ClockFmt = <b>%I:%M</b>
#        # 2 line view, time in bold above and date below
#        # ClockFmt = <span font="Sans 8"><b>%-l:%M</b> %P
%a %B %-e</span>
#        TooltipFmt = %A %x
#        #Action = xmessage Please define some command &
#        ShowCalendar = false
#        ShowTooltip = true
#    }
#}
# 'icons' plugin lets you customize window icons.
# these changes apply to entire desktop
Plugin {
    type = icons
    config {
        DefaultIcon = /usr/share/fbpanel/images/default.xpm
        application {
            icon = gnome-terminal
            ClassName = XTerm
        }
        application {
            icon = gnome-terminal
            ClassName = mlterm
        }
        application {
            icon = gnome-terminal
            ClassName = URxvt
        }
        application {
            icon = gnome-emacs
            ClassName = Emacs
        }
        application {
            icon = mozilla-firefox
            ClassName = Firefox-bin
        }
        application {
            icon = mozilla-firefox
            ClassName = Firefox
        }
    }
}
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