If needed, a recent version of Qutebrowser can be installed via
$ cd ~/Sources/External/github-qutebrowser-qutebrowser # where a checkout usually
# is on my system
$ python3 ./scripts/mkvenv.py --venv-dir ~/local/_qutebrowser
$ cd -
$ ~/local/_qutebrowser/bin/pip install readability-lxml
from inside a recent checkout. The underscore is there in the path
name in order to tell lib/profile/paths.sh to skip adding this three
to the path, as otherwise it will shadow system’s Python 3
installation.
Qutebrowser is going to fail to keep login sessions because different versions of WebEngine databases are incompatible (viz. qutebrowser/qutebrowser#5847 (comment)), so we need to delete the old database if it exists:
$ rm -r $HOME/.local/share/qutebrowser/webengine
(bin/launch-qutebrowser.bash should deal with this automatically, in case
you followed the above steps to build and install Qutebrowser, instead of
installing it through a package manager.)