I don't like the curves. To get back the square tabs disable nova in about:config.

Useless theme for an useless change of design. Firefox implemented these changes in their pathetic and desperate hopes to bring in some normies with "cool" design. And what they achieve? Losing more power users.

Doesn't revert rounded tabs despite picture saying it does AND gets all the colors wrong.

Doesn't actually get rid of the circular tabs etc despite the preview indicating that

Still looks more like Christmas decoration instead of rectangular tabs and text fields in preview.

why must you do this to me