This script assumes that I visit news.ycombinator.com to read news. I'd prefer a Firefox extension that compares the addresses of web pages I visit with links i

This script assumes that I visit news.ycombinator.com to read news. I'd prefer a Firefox extension that compares the addresses of web pages I visit with links in the news.ycombinator.com RSS feed. That way I'd be notified that there's a discussion thread about the page I'm currently viewing.