A dealbreaker as it doesn't suppport ublock origin extension which is essential to browsing the web these days.

Qutebrowser can use the same adblock filters that ublock uses.

Not really as customizable though, ublock has useful features like build your own filter and pick/create to block annoying webpage widgets. I do wonder if the python based aspects of qutebrowser might give a large surface to fork it and make this type of "hacker's browser" out of it though.