Why does Firefox display example1.foo when it should be displaying example2.foo?

Answer 1

It could be almost anything, in that 1) we don't know what experiments you did (did you ever trty the host by IP?) 2) we don't know the edit history on your httpd.conf (and did you remember to restart apache every time? and 3) we don't know how you're routing things to the server (real world DNS, your personal hosts file, or...)?

In such a situation, the general rule is to assume that everything caches stuff, everything in the cache(s) is wrong, and try again with a clean bench after any such change.

-- MarkusQ