[cxr]

Neither this comment nor my sibling mentioning Netscape 5 are correct. SeaMonkey's lineage is Netscape 6. Netscape 6 is from the early 2000s, not the late 90s. This is significant because they are different codebases, and there was a substantial gap between the latest mass market release in the 90s and the first release prepared from the new (nglayout, now known as Gecko) codebase. The code that was first released in the 90s was the then-in-progress state of the never-finished Netscape 5. The decision to scrap Netscape 5 is the source of the "never do a rewrite" meme that came out of Spolsky's article.