at the bottom of the browser on the right side you can see the small Icon for Tabs (Just to the right of the Bookmarks icon) click it, it opens all 50 tabs, select more from the top right corner of the screen and delete them from there!
아님
Your Phone is in EasyMode if you do not see the the tabs icon on the bottom of the pages. You will need to put you device in Standard Mode or you can turn the Internet option off in your EasyMode settings.