How to get rid of the oval shaped tabs?

[Daaaf]

How to get rid of the oval shaped tabs?
They are ugly and an inefficient way of using space.

How can I get rid of this?

[DiamondTiki]

A user has thankfully provided a solution on a different post here.

In the address bar, type about:config , then press ENTER
Accept any warning
Search for nova
Double-click on "browser.nova.enabled" to change it to "false"

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