Today, Facebook made my life difficult by discontinuing messenger.com and making it redirect to facebook.com/messages. I block facebook.com on my work computer, and have no intention of changing that. In the past, I used messenger.com to read messages without accessing facebook.com. The website blocker I was using, BlockSite, doesn't seem to have the ability to block facebook.com without also blocking facebook.com/messages.
What website blocking extension has features that would let me block everything on facebook.com except for facebook.com/messages?