fixup! Bug 40562: Added Tor Browser preferences to 000-tor-browser.js

Bug 42596: Add preferences for log levels.

Added a comment to start a section where we can put the various default
log levels.

browser/app/profile/000-tor-browser.js

@@ -108,3 +108,5 @@ pref("extensions.torlauncher.tordatadir_path", "");
 pref("extensions.torlauncher.bridgedb_front", "www.phpmyadmin.net");
 pref("extensions.torlauncher.bridgedb_reflector", "https://1723079976.rsc.cdn77.org");
 pref("extensions.torlauncher.moat_service", "https://bridges.torproject.org/moat");
+
+// Log levels