From MozillaZine Knowledge Base

The related preferences link to startup.homepage_override_url points to a non-existent page. The same problem occurs for a similar link in the background section. You might want to update the article to also deal with SeaMonkey. I added a see also link for the start page for mail (what I was looking for when I stumbled across this article) Tanstaafl 22:20, 11 February 2007 (UTC)