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This is a configurable extension that allows you to limit the time you spend browsing in websites. For each website you can define a time limit (e.g. 5 minutes every 2 hours, 1 hour every day).

Usage instructions: after installation, open the website for which a time limit is to be set in a new tab. Click the clock icon in the address bar to set a time limit. Whenever the time limit exceeds, you will get notified and the website will be blocked.