Turn off tabbed browsing: Chrome/Firefox - Is it possible? [duplicate]
There's no native option in Chrome or Firefox to turn tabs off, but you can find Extensions or addons to have a workaround feature.
Hiding Tab Bar in Firefox: https://addons.mozilla.org/en-US/firefox/addon/hide-tab-bar-with-one-tab/
A few quick searches didn't turn much up for chrome extensions that has something similar, but it's likely there is something out there.
If what you want is to hide the tab bar, you can do it with the TabMixPlus firefox add-on:
