OneTab is a chrome plugin that closes all your tabs and puts them in a nice list under one tab.
Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.
When your tabs are in the OneTab list, you will save up to 95% of memory because you will have reduced the number of tabs open in Google Chrome.
Know more about OneTab : https://www.one-tab.com/