It has some negative connotations worth disagreeing with, though. I for one am pro-Webextensions (WE) because the legacy APIs gave all addons unlimited privileges and kept Firefox internals from improving. WE apis have come miles; even Tree Style Tabs has a WE alternative.

I am hopeful for Qutebrowser, though; the dev is working on an interesting approach to extending the browser without WE support by allowing "userscripts" (not the Greasemonkey-esque ones). They can be written in tons of different languages. [Relevant documentation](https://qutebrowser.org/doc/userscripts.html).