Earlier quoted context omitted.
> 1) 1-word searches/domains or searches involving a domain-looking piece of text throw it off. Example I always run into: site:news.ycombinator.com foo bar baz "site" is an unknown protocol now, because it looks like a URL. I have to remember to put the search terms first.
Your example worked fine for me, and returned a list of search results from HN for me with the words 'foo' 'bar' and 'baz'.
The address wasn't understood
Firefox doesn't know how to open this address, because
the protocol (site) isn't associated with any program.
You might need to install other software to open this
address.
Firefox 21 on Ubuntu was giving me the same thing, I don't think I've tried it on Firefox 25 on my Ubuntu install.