SeaMonkey is a lightweight, yet fully functional Internet Application Suite. Nearly forgotten by most, it is still in active development and included by default in Slackware. For Debian based systems, a Repository called Ubuntuzilla is available. To easy up the installation process, I have created a little helper that allows you to set up the repository definition in the new DEB822 format. https://www.spacefun.ch/tuxwiz#seamonkey