I switched from Firefox + Chromium to Qutebrowser a few weeks ago. So far it is really nice. Since QtWebengine is Chromium-based and is a relatively recent version of Chromium, it works very well with all sites so far, vastly better than the older QtWebkit version I tried a year ago.
I hope that someone will write a Qutebrowser version of Bypass Paywalls [1].
I also find that the Qutebrowser's ad blocking is a bit underwhelming compared to uBlock Origin, with a lot of ads getting through or being incompletely blocked, although work is being done on that [2].
The password filling scripts are also hit or miss but I just copy my passwords from the terminal using `pass`.