This is kind of what happened to the KeeFox addon for Firefox.
The developer one day decided to have a new default for URL matching. Instead of matching the hostname, i.e. old.reddit.com, it would then match the 'domain' i.e *reddit.com.
Back then it was as stupid as this is now...
It isn't that simple, for example I don't use old.reddit as a URL, but I use RES or another program to force it into the old configuration regardless of the URL.
The best thing about this is other people don't need "old.reddit.com" to "new.reddit.com" redirector extensions. Reddit assumes if you put "old." or "new." then you explicitly want to override your account's preferences.
127.0.0.1 reddit.com www.reddit.com
I put it in so that it would force me to use old.reddit.com instead. After a couple weeks old.reddit.com has became entirely automatic.
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