[qutebrowser] Feature request and bug

[Andy Ashley]

I have a feature request: to be able to delete storage when closing 
qutebrowser.
The directories:
.cache/qutebrowser/webengine/Cache/
.local/share/qutebrowser/webengine/Service Worker
in particular grow very large. It's difficult to know what I can safely 
delete.

Memory use has also increased (and keeps increasing the longer 
qutebrowser is running). I've only noticed it since Qt5.15, but I run 
out of memory after 2 days of qutebrowser open, would go a week without 
noticing before.

Using Arch Linux, Xfce desktop, qutebrowser with webengine backend.