log level: don't log warnings for about: pages
Using HTTPS Everywhere 3.4.2 on Firefox with extensions.https_everywhere.LogLevel set to 5 (WARN). Every time I "visit" a about: page (e.g. about:config, about:blank, about:addons, ...) HTTPS Everywhere logs that to stdout:
Could not check applicable rules for about:config
uri.host is explosive!
(about:blank)
This log message isn't useful for anything so HTTPS Everywhere should just ignore about: URLs in my opinion.