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Set a tab limit and stop tab overload. Tab Cap blocks new tabs when you reach your limit. Most people keep too many tabs open. Not because they need them all, but because closing them feels risky. The result is a browser that looks like an unfinished to-do list. And a mind that feels the same way. Tab Cap is a Chrome extension that sets a hard limit on how many tabs you can have open at once. When you reach the limit, new tabs are blocked. Not closed. You see a clear message and decide what to do next. How it works You set a tab limit in the extension settings. The default is 10. When you try to open a tab beyond that number, you land on a simple blocking page instead of the new page. From there you can pause the limit temporarily, add the site to a whitelist, or open the settings to adjust your limit. You can scope the limit to a single window or apply it globally across all windows. Pinned tabs and system pages can be excluded from the count. If you use certain sites constantly, you can whitelist them so they open freely without counting against your limit. Why a hard limit works better than tab cleanup tools The most common response to too many tabs is a cleanup extension. You archive everything, clear the tab bar, and start fresh. A week later the tabs are back. Cleanup tools don't change the behavior that created the pile. They just postpone it. A hard limit is different. It stops accumulation before it happens. Behavioral economists call this a commitment device: a constraint you set in advance that prevents a bad decision at the moment it would otherwise occur. You don't need willpower in the moment. You needed to set the limit when you weren't under pressure. Tab Cap holds that decision for you. The research behind it Researchers at Carnegie Mellon University studied browser tab behavior in detail. Their findings: 55% of users have difficulty closing tabs, 30% self-identify as having a tab hoarding problem, and only 19% blamed laziness. The main driver was fear of losing access to information. Every open tab is an unfinished task. Psychologist Sophie Leroy's research on attention residue found that switching away from an unfinished task leaves part of your attention stuck on it. More open tabs means more distributed attention, even when you're not looking at them. The American Psychological Association summarizes research showing task switching carries a productivity penalty of up to 40%. Tab Cap doesn't fix this by reminding you to close tabs. It fixes it by making accumulation harder. Settings Tab limit: set any number from 1 upward. The default is 10. Scope: per window, or global across all windows. Exclude pinned tabs from the count. Exclude system pages (chrome:// URLs). Whitelist specific domains so they always open freely. Pause the limit for 5, 15, or 30 minutes, or 1 hour, when you need a break from the constraint. Who uses it People who find themselves with 30 tabs open by the end of the day and aren't sure how it happened. Developers who keep documentation, Stack Overflow, GitHub, and local tools open at the same time. Students who accumulate research tabs across sessions. Anyone who has noticed that a full tab bar makes it harder to focus, not easier. Tab Cap is not for everyone. If you genuinely need 40 tabs open at once, a hard limit will get in the way. But most people who think they need that many don't. The median browser tab is used for two minutes and 38 seconds before being abandoned. Most tabs aren't active tools. They're deferred decisions. About One Tab Rule Tab Cap is the enforcement tool for the One Tab Rule, a method for working with one active browser tab at a time. The method doesn't require the extension. But if you find the habit hard to build without something enforcing it, Tab Cap is what the extension is for. More about the method and the research behind it at onetabrule.com