Group Tabs extension allows you to save a collection of tabs as a group and view them later. The usage is so simple that just click the extension icon, view the tabs which are opened in the current window, delete the tabs which you don't want in collection, give a name to your to collection and save. Viola, your saved collection can be viewed in groups tab. You can view the tabs in the collection, bulk open the tabs in new window or delete the collection from groups. This extension is ad-free with no unnecessary distractions.The later versions will be primarily focused on performance of the extension.