reddit_sfw.user.js

// Tested with Opera only!
//
// ==UserScript==
// @name          reddit sfw
// @description   Removes reddits from /r/nsfw & with [NSFW] tag in title
// @include       http://www.reddit.com/*
// ==/UserScript==

var items = document.getElementsByClassName("thing");
for (i=0; i < items.length; i++)
{
	if(items[i].tagName.match(/div/i))
	{
		var remove = false;
		
		// Check based on url
		var els = items[i].getElementsByClassName("comments");
		
		if(els.length > 0)
		{
			if(els[0].href && els[0].href.match(/nsfw/))
			{
				remove = true;
			}
		}
		
		// Check based on title
		els = items[i].getElementsByClassName("title");
		
		if(els.length > 0)
		{
			if(els[0].innerText && els[0].innerText.match(/nsfw/i))
			{
				remove = true;
			}
		}
		
		// Hide it
		if(remove)
		{
			items[i].style.display = "none";
		}
	}
}