For all Firefox users:
- Install the add-on called LeechBlock.
- After you install LeechBlock. Go to Open Menu (horizontal 3 bar button located at the top right of the browser window)

- Go to Add-ons

- You will now see all the installed add-ons. Click on the Options button for the LeechBlock

- You can now set what, how and when to block. Under the "Block Set 1" tab --> "What to Block" enter the domain name "www.msn.com"

- Now under the the same "Block Set 1" tab --> "When to Block" . Click on "All Day" and "Every Day" buttons

- Now, in this next option you can put you can tell LeechBlock what you would like to redirect the msn site to. If you want to go back to the default Firefox home page, type "about:home" in the URL option. Or you can put any other URL of your liking.

- Done !!!!
Note: LeechBlock has a lot of options for customization. In step 5 of the instruction you can add more URL sites to block. Also you have multiple tabs of Block Sets, so you can add other URL sites to be blocked and forwarded to other sites. In step 6 we
set our block to 24/7 every day of the week, but you can change that to your need.
Also I would recommend installing the Adblock Plus. This will block all the ads, very useful for youtube ad blocking.