As per the xombrero.conf packaging issue noted by Rich above, first run xombrero does not create this file and it is not present in the SCE. Downloaded and tested the sample config Rich linked above and it works when placed as ~/.xombrero.conf (not into ~/.xombrero/). Without this config file user is unable to define options and xombrero does not by default remember preferred window size, etc. If a xombrero startup script could auto-populate /home/$USER/.xombrero.conf with this default file it would make the browser more functional. Thanks.
~/.xombrero.conf:
##
## GENERAL SETTINGS
##
#
# The strategy for the config file is as follows:
#
# Boolean values are the opposite of the default and need to simply be
# uncommented to alter the default.
#
# Text values *are* set to the default and in order to change them one must
# uncomment the option *and* change the value.
#
# NOTE: browser_mode and gui_mode MUST be the first entries in this
# file!
# Normal browser operation (default).
# browser_mode = normal
# Prevent tracking operation.
# browser_mode = whitelist
# Classic GUI (default).
# gui_mode = classic
# Minimalistic GUI.
# gui_mode = minimal
# home = https://www.cyphertite.com
# download_dir = ~/downloads
# download_mode = start
# download_notifications = 1
# window_maximize = 1
# window_width = 1024
# window_height = 768
# enable_spell_checking = 1
# spell_check_languages = en_US
# default_zoom_level = 1.0
# encoding = UTF-8
# ssl_ca_file = /etc/ssl/cert.pem
# ssl_strict_certs = 1
# enable_strict_transport = 0
# ctrl_click_focus = 1
# append_next = 0
# save_global_history = 1
# color_visited_uris = 0
# guess_search = 1
# enable_autoscroll = 1
# session_autosave = 1
# history_autosave = 1
# autofocus_onload = 1
# single_instance = 1
# enable_socket = 1
# enable_js_autorun = 0
# auto_load_images = 0
# enable_localstorage = 0
# userstyle = /usr/local/share/xombrero/style.css
# userstyle_global = 1
# enable_favicon_entry = 0
# enable_favicon_tabs = 1
# preload_strict_transport = 1
# referer = always
# warn_cert_changes = 1
# enable_cache = 1
# js_auto_open_windows = 0
# See http://www.xroxy.com/proxylist.php for a good list of open
# proxies.
#
# polipo
# http_proxy = http://127.0.0.1:8123
#
# tsocks
# http_proxy = http://127.0.0.1:1080
#
# If you only occasionally use a proxy
# http_proxy_starts_enabled = 0
# Search engines; uncomment one of these lines for you favorite search
# engine.
#
# Google
# search_string = https://www.google.com/search?q=%s
#
# Yahoo
# search_string = http://search.yahoo.com/search?p=%s
#
# Start Page
# search_string = https://startpage.com/do/search?language=english_us&cat=web&query=%s
#
# DuckDuckGo
# search_string = https://www.duckduckgo.com/?q=%s
# External editor.
# NOTE: The editor specified here must not fork into the background.
#
# Examples of editors:
# external_editor = gvim -f <file>
# external_editor = xterm -geometry 177x58+0+0 -font -*-fixed-medium-r-*-*-15-*-*-*-*-*-iso8859-* -e vim -f <file>
# external_editor = emacsclient -c <file>
# "default_script" points to a script executed by the run_script
# command. The only argument passed to this script is the current URI.
#
# default_script = ~/.xombrero/playflash.sh
# "user_agent" can be set to just about anything, for a comprehensive
# list see: http://www.useragentstring.com/pages/All/ . If more than one
# "user_agent" is given, then xombrero will use them in a round-robin
# fashion for each request.
#
#user_agent = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729)
#user_agent = Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
#user_agent = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/3.0.195.27 Safari/532.0
#user_agent = Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7C144 Safari/528.16
#
##
## ALIASES
##
# Aliases are given in the following format:
#
# alias = <alias>, <link>
#
# Where the link part might contain "%s", the "%s" will be substituted
# with the user's input when the alias is expanded.
# alias = s, https://www.google.com/search?q=%s
# alias = w, https://secure.wikimedia.org/wikipedia/en/w/index.php?title=Special%3ASearch&search=%s
# alias = ports, http://openports.se/search.php?so=%s
##
## COOKIE, JAVASCRIPT AND PLUGIN WHITE LISTS
##
# Add the domains you trust.
# cookie_wl = .conformal.com
# cookie_wl = .peereboom.us
# js_wl = .conformal.com
# js_wl = .peereboom.us
# pl_wl = .conformal.com
# pl_wl = .peereboom.us
##
## FORCE HTTPS FOR SITES
##
# Add the domains of sites that should be only accesed over HTTPS.
# force_https = .conformal.com
##
## MIME TYPES
##
# PDF, note that xpdf can't load a URI directly; use "@" in front of
# mime_type to indicate to download the file first.
# mime_type = application/pdf,kpdf
# mime_type = @application/pdf,xpdf
# Specific MIME type for video.
# mime_type = video/x-ms-wmv,mplayer
# mime_type = video/quicktime,mplayer
# Default MIME type for video.
# mime_type = video/*,mplayer
# Default MIME type for audio.
# mime_type = audio/*,vlc
# Word documents.
# mime_type = application/msword,soffice
# Ignoring flash can be done by using the donothing pseudo-binary.
# mime_type = application/x-shockwave-flash,donothing
##
## ADVANCED SETTINGS
##
# resource_dir = /usr/local/share/xombrero/
# refresh_interval = 10
# url_regex = ^[[:blank:]]*[^[:blank:]]*([[:alnum:]-]+\.)+[[:alnum:]-][^[:blank:]]*[[:blank:]]*$
# gnutls_priority_string = NORMAL:%COMPAT
# NOTE: webkit 1.4.x overwrites these values!
# max_host_connections = 5
# max_connections = 25
##
## ADVANCED GUI SETTINGS
##
# The following low-level GUI settings are set by the high-level setting
# "gui_mode".
# The settings for "gui_mode = classic" are as follows:
# fancy_bar = 1
# show_tabs = 1
# tab_style = normal
# userstyle_global = 0
# show_url = 1
# show_statusbar = 0
# show_scrollbars = 1
# The settings for "gui_mode = minimal" are as follows:
# fancy_bar = 0
# show_tabs = 1
# tab_style = compact
# show_url = 0
# show_statusbar = 1
# show_scrollbars = 0
# The following are settings shared between "classic" and "minimal"
# "gui_mode":
# statusbar_elems = BP
# icon_size = 2
# cmd_font = monospace normal 9
# oops_font = monospace normal 9
# statusbar_font = monospace normal 9
# tabbar_font = monospace normal 9
##
## ADVANCED COOKIE AND JAVASCRIPT SETTINGS
##
# The following low-level settings are set by the high-level setting
# "browser_mode", and shouldn't be tweaked manually unless you know what
# you are doing.
# The settings for "browser_mode = normal" are as follows:
# allow_volatile_cookies = 0
# cookie_policy = allow
# cookies_enabled = 1
# enable_cookie_whitelist = 0
# read_only_cookies = 0
# save_rejected_cookies = 0
# session_timeout = 3600
# enable_scripts = 1
# enable_js_whitelist = 0
# enable_localstorage = 1
# enable_plugins = 1
# enable_plugin_whitelist = 0
# allow_insecure_content = 1
# allow_insecure_scripts = 1
# do_not_track = 0
# The settings for "browser_mode = whitelist" are as follows:
# allow_volatile_cookies = 0
# cookie_policy = no3rdparty
# cookies_enabled = 1
# enable_cookie_whitelist = 1
# read_only_cookies = 0
# save_rejected_cookies = 0
# session_timeout = 3600
# enable_scripts = 0
# enable_js_whitelist = 1
# enable_localstorage = 0
# enable_plugins = 0
# enable_plugin_whitelist = 1
# allow_insecure_content = 0
# allow_insecure_scripts = 0
# do_not_track = 1
##
## KEY BINDINGS
##
# To delete all default keybindings use "keybinding = clearall".
#
# keybinding = clearall
#
# Key names can be found at:
#
# http://git.gnome.org/browse/gtk+/tree/gdk/gdkkeysyms-compat.h
#
# Just chop off the "GDK_" part and you have the keyname. Or look at:
#
# http://git.gnome.org/browse/gtk+/tree/gdk/gdkkeysyms.h
#
# and chop off "GDK_KEY_".
#
# Be aware that the names are case sensitive!
#
# The default keybindings are the following:
#
# keybinding = command,colon
# keybinding = search,slash
# keybinding = searchb,question
# keybinding = command_mode,!Escape
# keybinding = insert_mode,i
# keybinding = cookiejar,!M1-j
# keybinding = downloadmgr,!M1-d
# keybinding = history,!M1-h
# keybinding = print,!C-p
# keybinding = quitall,!C-q
# keybinding = restart,!M1-q
# keybinding = run_script,!M1-r
# keybinding = js toggle,!C-j
# keybinding = cookie toggle,!M1-c
# keybinding = togglesrc,!C-s
# keybinding = yankuri,y
# keybinding = pasteuricur,p
# keybinding = pasteurinew,P
# keybinding = toplevel toggle,!F4
# keybinding = help,!F1
# keybinding = proxy toggle,!F2
# keybinding = searchnext,n
# keybinding = searchprevious,N
# keybinding = focusaddress,!F6
# keybinding = focussearch,!F7
# keybinding = hinting,f
# keybinding = hinting,period
# keybinding = hinting_newtab,S-F
# keybinding = hinting_newtab,comma
# keybinding = userstyle,s
# keybinding = userstyle_global,S
# keybinding = goback,BackSpace
# keybinding = goback,!M1-Left
# keybinding = goforward,!S-BackSpace
# keybinding = goforward,!M1-Right
# keybinding = reload,!F5
# keybinding = reload,!C-r
# keybinding = reload,!C-l
# keybinding = favorites,!M1-f
# keybinding = scrolldown,j
# keybinding = scrolldown,Down
# keybinding = scrollup,k
# keybinding = scrollup,Up
# keybinding = scrollbottom,G
# keybinding = scrollbottom,End
# keybinding = scrolltop,Home
# keybinding = scrollpagedown,space
# keybinding = scrollpagedown,!C-f
# keybinding = scrollpagedown,Page_Down
# keybinding = scrollhalfdown,!C-d
# keybinding = scrollpageup,Page_Up
# keybinding = scrollpageup,!C-b
# keybinding = scrollhalfup,!C-u
# keybinding = scrollright,l
# keybinding = scrollright,Right
# keybinding = scrollfarright,dollar
# keybinding = scrollleft,h
# keybinding = scrollleft,Left
# keybinding = scrollfarleft,0
# keybinding = statustoggle,!C-n
# keybinding = stop,!S-F5
# keybinding = tabnew,!C-t
# keybinding = tabclose,!C-w
# keybinding = tabundoclose,U
# keybinding = tabnext 1,!C-1
# keybinding = tabnext 2,!C-2
# keybinding = tabnext 3,!C-3
# keybinding = tabnext 4,!C-4
# keybinding = tabnext 5,!C-5
# keybinding = tabnext 6,!C-6
# keybinding = tabnext 7,!C-7
# keybinding = tabnext 8,!C-8
# keybinding = tabnext 9,!C-9
# keybinding = tabfirst,!C-less
# keybinding = tablast,!C-greater
# keybinding = tabprevious,!C-Left
# keybinding = tabnext,!C-Right
# keybinding = focusout,!C-minus
# keybinding = focusin,!C-equal
# keybinding = focusin,!C-plus
# keybinding = focusreset,!C-0
# keybinding = editelement,!C-i
# keybinding = passthrough,!C-z
# keybinding = :open ,!F9
# keybinding = :open <uri>,!F10
# keybinding = :tabnew ,!F11
# keybinding = :tabnew <uri>,!F12
# parse the contents of another configuration file
# include_config = ~/.xombrero_alternate.conf