Try closing every browser tab except the one you need right now.
Not eventually. Now. Command-W until there’s one left.
Tabs are deferred decisions. Each one is something you told yourself you’d get back to. The pile grows faster than you can process it, and the mental weight of “all those open tabs” becomes its own distraction.
One tab forces a choice: what actually matters right now? Everything else can be searched again in ten seconds if you genuinely need it. You will not need most of it.