This is a Greasemonkey script that changes the Facebook logo at the top of the page to point to your custom list. Like this
Enter the ID to the Facebook list. ID = the bold part in this example: https://www.facebook.com/lists/69323874238711010
Download the file and open it in Firefox. If you have Greasemonkey a popup should appear that prompts you to install it.
If you open it in Chrome, it will install like any other extension.