[Stylish Firefox] Database error with browser.privatebrowsing.autostart=true
browser.privatebrowsing.autostart = true in about:config. Or in about:preferences go to "Privacy & Security" and set History to "Never remember history".
Then the webextension add-on does not work properly and it shows this error:
An error has occurred using the Stylish database. Would you like to visit a web page with possible solutions?