fixup! Firefox preference overrides.

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/001-base-profile.js

@@ -647,6 +647,8 @@ pref("privacy.query_stripping.strip_on_share.enabled", true);
 // Disable platform text recogniition functionality (tor-browser#42057)
 pref("dom.text-recognition.enabled", false);
 
+// Log levels
+
 #ifdef XP_WIN
 pref("browser.taskbar.lists.enabled", false);
 pref("browser.taskbar.lists.frequent.enabled", false);