Introduction to SeaMonkey

SeaMonkey is a browser suite, the Open Source sibling of Netscape. It includes the browser, composer, mail and news clients, and an IRC client. It is the follow-on to the Mozilla browser suite.

The Mozilla project also hosts two subprojects that aim to satisfy the needs of users who don't need the complete browser suite or prefer to have separate applications for browsing and e-mail. These subprojects are Firefox-48.0.2 and Thunderbird-45.3.0. Both are based on the Mozilla source code.

This package is known to build and work properly using an LFS-7.10 platform.

Package Information

Additional Downloads



The tarball seamonkey-2.40.source.tar.xz will untar to seamonkey-2.40 directory.

SeaMonkey Dependencies


alsa-lib-1.1.2, GTK+-2.24.30, UnZip-6.0, yasm-1.3.0, and Zip-3.0



SQLite-3.14.1 (not recommended due to potential security concerns)



If you don't install recommended dependencies, then internal copies of those packages will be used. They might be tested to work, but they can be out of date or contain security holes.



You must have installed Openssl before Python 2 or the build system will quickly fail with output including "ImportError: cannot import name HTTPSHandler". If you are in any doubt about this (e.g. upgrading from an older version of Seamonkey), check if /usr/lib/python2.7/lib-dynload/ exists. If it does not, reinstall Python-2.7.12 (after installing OpenSSL-1.0.2h. The latest version of any currently maintained version of Openssl should be satisfactory if already installed.


cURL-7.50.1, dbus-glib-0.106, Doxygen-1.8.11, GConf-3.2.6, gst-plugins-base-1.8.3 (with gst-plugins-good-1.8.3 and gst-libav-1.8.3 at runtime), OpenJDK-, PulseAudio-9.0, startup-notification-0.12, Valgrind-3.11.0, Wget-1.18, Wireless Tools-29, and Hunspell

User Notes:

Installation of SeaMonkey

The configuration of SeaMonkey is accomplished by creating a mozconfig file containing the desired configuration options. A default mozconfig file is created below. To see the entire list of available configuration options (and an abbreviated description of each one), issue ./configure --help. You may also wish to review the entire file and uncomment any other desired options. Create the file by issuing the following command:

cat > mozconfig << "EOF"
# If you have a multicore machine, all cores will be used by default.
# If desired, you can reduce the number of cores used, e.g. to 1, by
# uncommenting the next line and setting a valid number of CPU cores.
#mk_add_options MOZ_MAKE_FLAGS="-j1"

# If you have installed DBus-Glib comment out this line:
ac_add_options --disable-dbus

# If you have installed dbus-glib, and you have installed (or will install)
# wireless-tools, and you wish to use geolocation web services, comment out
# this line
ac_add_options --disable-necko-wifi

# GStreamer is necessary for H.264 video playback in HTML5 Video Player;
# to be enabled, also remember to set "media.gstreamer.enabled" to "true"
# in about:config.  If you have GStreamer 1.x.y, uncomment this line:
#ac_add_options --enable-gstreamer=1.0

# Uncomment these lines if you have installed optional dependencies:
#ac_add_options --enable-system-hunspell
#ac_add_options --enable-startup-notification

# Comment out following option if you have PulseAudio installed
ac_add_options --disable-pulseaudio

# Comment out following option if you have gconf installed
ac_add_options --disable-gconf

# Comment out following options if you have not installed
# recommended dependencies:
# Do not use system SQLite for SeaMonkey based on XUL-47
#ac_add_options --enable-system-sqlite
ac_add_options --with-system-libevent
ac_add_options --with-system-libvpx
ac_add_options --with-system-nspr
ac_add_options --with-system-nss
ac_add_options --with-system-icu

# The BLFS editors recommend not changing anything below this line:
ac_add_options --prefix=/usr
ac_add_options --enable-application=suite

ac_add_options --disable-crashreporter
ac_add_options --disable-updater
ac_add_options --disable-tests

ac_add_options --enable-optimize
ac_add_options --enable-strip
ac_add_options --enable-install-strip

ac_add_options --enable-gio
ac_add_options --enable-official-branding
ac_add_options --enable-safe-browsing
ac_add_options --enable-url-classifier

# Use internal cairo due to reports of unstable execution with
# system cairo
#ac_add_options --enable-system-cairo
ac_add_options --enable-system-ffi
ac_add_options --enable-system-pixman

ac_add_options --with-pthreads

ac_add_options --with-system-bz2
ac_add_options --with-system-jpeg
ac_add_options --with-system-png
ac_add_options --with-system-zlib

mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/moz-build-dir


If you are compiling SeaMonkey in chroot, make sure you have the SHELL environment variable set or prepend SHELL=/bin/sh to the first make command below.

The moz-build-dir directory needs to exist and match the value used in mozconfig (above) for the object directory (MOZ_OBJDIR):

mkdir -vp mozilla/moz-build-dir

Compile SeaMonkey by running the following commands:

Fix an issue with GCC-6.0 and higher:

patch -d mozilla/ -Np1 -i ../../seamonkey-2.40-gcc6-1.patch
export CFLAGS+=" -fno-delete-null-pointer-checks -fno-lifetime-dse -fno-schedule-insns2" &&
export CXXFLAGS+=" -fno-delete-null-pointer-checks -fno-lifetime-dse -fno-schedule-insns2" &&

make -f

This package does not come with a test suite.

Install SeaMonkey by issuing the following commands as the root user:

make  -f install INSTALL_SDK=                              &&
chown -R 0:0 /usr/lib/seamonkey-2.40                  &&
cp    -v moz-build-dir/dist/man/man1/seamonkey.1 /usr/share/man/man1 &&


All the Development Libraries and Headers

If you want to install the full SeaMonkey development environment, as the root user:

make -C moz-build-dir install

Command Explanations

mkdir -vp mozilla/moz-build-dir: fixes a build failure of Makefile at the beginning of the build, where a file cannot be found.

export CFLAGS= ... export CXXFLAGS= ...: These settings work around code which gcc6 would otherwise regard as out-of-specification and allow it to produce a working program.

make -f Mozilla products are packaged to allow the use of a configuration file which can be used to pass the configuration settings to the configure command. make uses the file to get initial configuration and setup parameters.

Configuring SeaMonkey

For installing various SeaMonkey plugins, refer to Mozdev's PluginDoc Project.

Along with using the “Preferences” menu to configure SeaMonkey's options and preferences to suit individual tastes, finer grain control of many options is only available using a tool not available from the general menu system. To access this tool, you'll need to open a browser window and enter about:config in the address bar. This will display a list of the configuration preferences and information related to each one. You can use the “Filter:” bar to enter search criteria and narrow down the listed items. Changing a preference can be done using two methods. One, if the preference has a boolean value (True/False), simply double-click on the preference to toggle the value and two, for other preferences simply right-click on the desired line, choose “Modify” from the menu and change the value. Creating new preference items is accomplished in the same way, except choose “New” from the menu and provide the desired data into the fields when prompted.



There is a multitude of configuration parameters you can tweak to customize SeaMonkey. A very extensive list of these parameters can be found at

If you use a desktop environment like Gnome or KDE you may wish to create a seamonkey.desktop file so that SeaMonkey appears in the panel's menus. If you didn't enable Startup-Notification in your mozconfig change the StartupNotify line to false. As the root user:

mkdir -pv /usr/share/{applications,pixmaps}              &&

cat > /usr/share/applications/seamonkey.desktop << "EOF"
[Desktop Entry]
Comment=The Mozilla Suite

ln -sfv /usr/lib/seamonkey-2.40/chrome/icons/default/seamonkey.png \


Installed Programs: seamonkey
Installed Libraries: Numerous libraries, browser, and email/newsgroup components, plugins, extensions, and helper modules installed in /usr/lib/seamonkey-2.40
Installed Directory: /usr/lib/seamonkey-2.40

Short Descriptions


is the Mozilla browser/email/newsgroup/chat client suite.

Last updated on 2016-09-02 17:21:43 -0700