I refuse to use any browser without vertical tabs.
https://chrome.google.com/webstore/detail/tabs-outliner/eggk...
There's an add-on for simple vertical tabs, but I think this is even better.
BTW you can move the tab outliner itself to a tab and close the window.
If you haven't used it before, and if you're prone to having 10+ tabs open at a time, I highly recommend it. Although I warn you that you may never wish to use Safari or Chrome again...
Chrome used to have a similar feature built-in but they removed it ages ago.