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Tabox is a free extension for Chrome and other Chromium based browsers (like Edge and Brave) that lets you save all your currently open tabs into a collection. You can also export a collection into a file that you can share with others, for example, if you need to share a number of work related sites with your team. Tabox also offers a way to sync your collections between computers using Google Drive. It is 100% open source and is being actively worked on with numerous new features and improvements being suggested by the community.