Close Other Tabs.
Add "Close Others" Button into toolbar.
All tabs except the current tab will be closed.
Close Left: https://chrome.google.com/webstore/detail/close-left/gdpopcppmglkiodhjobnjbogcoacgkoa
Close Right: https://chrome.google.com/webstore/detail/close-right/npemobdkdcknhfaiioheeffincgpgafj