Rated 5 out of 5 stars

SeaMonkey users have long yearned for vertical tabs and apart from rumors that TST once worked with an ancient version, the browser has been bereft heretofore. Vertical tabs are of the killer add-on class for many users, and this has previously prevented many an inquiring mind using Firefox to switch over. Though I wish this could be a port of TST instead of the simpler VertTabs, this is through no fault of the developer who has done an excellent job and answered the masses clamoring for tabs on the side. I can only hope they will keep this add-on updated so that SeaMonkey will remain more viable. If you ever feel like asking for donations, I would gladly give $5.