Try to practice a ritual like writing the names of websites down and then throwing the piece of paper into the trash. I find that it helps to interrupt the mind

Try to practice a ritual like writing the names of websites down and then throwing the piece of paper into the trash. I find that it helps to interrupt the mindless opening of the distracting sites. It gives me a brief moment as I'm opening the distraction where I remember that I chose to sacrifice this thing, and I bail out. This requires regular practice of whatever ritual you create.