HTTPS-Everywhere should not dump URLs to stdout by default
On many systems including MacOS and several Linux Desktops, the console output of Firefox ends up written to disk. Since HTTPS-Everywhere can log urls at any loglevel, this means that the user's browsing activity ends up on disk in these logs as well.
We should make a log scrubber for removing/omitting these urls either above a certain loglevel setting, or if a separate pref is set.