When comparing SeaMonkey vs Mypal, the Slant community recommends SeaMonkey for most people. In the question“What are the best browsers not based on Chromium?” SeaMonkey is ranked 8th while Mypal is ranked 9th. The most important reason people chose SeaMonkey is:
Wraps all your internet stuff together. It's like it's Firefox and Thunderbird all wrapped into one, and it kinda is. It's the continuation of the project both of those were extracted from.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Full internet suite
Wraps all your internet stuff together. It's like it's Firefox and Thunderbird all wrapped into one, and it kinda is. It's the continuation of the project both of those were extracted from.
Pro Not bloatware
Pro Designed for usability, not looks
Pro Customizable with Pale Moon and some Firefox addons
Supports add-ons from PM, Firefox and other Mozilla add-ons websites (xpi).
Pro All video formats supported
Does better than Firefox 52 in that regard.
Pro Supports Windows Vista
Pro Now supports pdf inside browser
Cons
Con Bloated with unnecessary features
Seamonkey has a browser, email client, and even an IRC chat. Too much bloat! It doesn't do one thing, let alone do anything well. It should be avoided.
Con Looks very old and outdated
Con No Addons
not a single adblocker or privacy addon that was useful
Con Intermittent text distortion problem
Con Outdated
Becomes sluggish when surfing lots of hours, lacks compatibility with Firefox quantum add-ons.