Now why is SeaMonkey missing from LinuxMint software listings?
It has many uses from web Browser to web page authoring and in the Web page Authoring mode it is at lest WYSIWYG (What You See Is What You Get).
Browser of chioce in my case is Firefox.
E-mail client of Chioce is Thunderbird.
Both of which i has used for years.
As for Web Page Authoring SeaMonkey In My Humble Opinon comes a close second to DreamWeaver.