Slowing down the dopamine feedback loop works. Many impulses that lead to distraction are automatic, not conscious. Ever closed a Hacker News tab just for your fingers to immediately re-type the URL into the bar and hit enter? There are browser extensions that delay loading pages on a given site for a number of seconds, to cut off that sort of automatic behavior, and they work as long as the delay to load the site is less than the time and effort it takes to open up your addons manager and disable the addon.