Rddt is a project mainly written in JavaScript, it's free.
A reddit.com Safari extension
This extension was born from these ideas:
Hence, an extension for Safari that adds a little "HUD" style overlay providing a tiny bit of context for what the fine folks at reddit.com may think of the particular page you are viewing.
If it appears as though no one has submitted the page yet, it conveniently becomes a link to reddit.com's submission page.