If you want to carry on using Chrome, you can create a script to do stuff like this. I believe it also works in Firefox, not sure if you need to do anything different.
In notepad, or whatever you can create text files in on a Mac:
[list]
[*] create a file called siteblocker.user.js (anyname as long as it ends “.user.js”.[/*]
[*]Copy and Paste this in:[/*]
// ==UserScript==
// @name Block Singletrackworld and Facebook
// @include http://www.singletrackworld.com/*
// @include http://www.Facebook.com/*
// @author thebunk
// @description Stops access to the best website in the internet – whoever wrote this should be ashamed of themselves. The author accepts no responsibility for anything bad that happens, ever.
// ==/UserScript==
window.open(“about::blank”, “_self”);
[*]Save the file.[/*]
[*]Drag the file from wherever you saved it onto a Chrome window and hit “Continue” where the file appears at the bottom, then “Install” when the dialog box pops up[/*]
[*]Try and go to your beloved sites, time-wasting scoundrel…[/*]
[*] 8)[/*]
[*]If you want to disable it, just ask (I’ll never tell though)[/*]
[/list]