You can download the latest Sea Monkey releases here and 64-bit issues are a thing of the past now:
It's a little tricky if you are running a 64-bit OS which most people will be.
The weird thing is that the Seamonkey website for Linux seems to only provide a 32-bit download.
seamonkey-2.49.2.tar.bz2
Seamonkey is still provided as a tar.bz2 which you need to extract and run manually.
First unpack it
tar -jxvf seamonkey-2.49.2.tar.bz2
Try to run it
./seamonkey
XPCOMGlueLoad error for file /home/queenlazina/Downloads/seamonkey/libmozgtk.so:
libgtk-3.so.0: cannot open shared object file: No such file or directory
Couldn't load XPCOM.
Seems that libgtk is installed:
ls /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
/usr/lib/x86_64-linux-gnu/libgtk-3.so.0
But note it is 64-bit and you need the 32-bit library since Seamonkey is 32-bit.
We need to enable i386/32-bit architecture and add the libgtk for 32 bit
sudo dpkg --add-architecture i386
sudo apt-get install libgtk-3-0:i386
After that you can run Seamonkey finally!
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