"viewport" extension is a tool which could open multi-viewports(webs) in one window screen.
which could help enjoying more webs(videos) at one time, browsing the Internet efficiently ,
especially useful in Conference/Hall Super screen
what and how to use this extension?
chrome extension：
https://chrome.google.com/webstore/detail/viewport/npgjahajhclmlbijjeekjaodgmokngpp
firefox extension:
https://addons.mozilla.org/zh-CN/firefox/addon/viewportgroup
contact: viewportgroup@outlook.com