Close + save the tabs you don't need at the moment. A lightweight solution to the problem of too many tabs.
Stashing tabs means closing them, and at the same time saving them as a stash in the extension popup. If you click that stash, the opposite happens: the stash is removed from the popup and the tabs are reopened.
When you have a bunch of tabs open that you aren't closing just because you need to get back to them later, but they're eating up computer resources and causing clutter, this extension is a quick and convenient way to temporarily get rid of them.
Like bookmarks, stashes are synced across devices via Chrome's (not very fast) built-in mechanism.
Source code: https://github.com/ivan7237d/stash-tabs