Coming from vim-vixen, I must say this is dope, some people complain about the new tab default change after installing this extension, but I find it fine tbh.
Enough people complained + someone cared enough to help out, so we now offer a build without a new tab page [1]. Migration between the builds is much the same as the process documented here [2].
[1]: https://tridactyl.cmcaine.co.uk/betas/nonewtab/tridactyl_no_...
[2]: https://github.com/tridactyl/tridactyl/wiki/Migration-from-s...