Simply excellent and flexible. Only request of the developers it make a simple checkbox in this general options tab to essentially put 'about:addons' and 'about:support' and 'about:config' behind a password at all times. The workaround to protect Leechblock from being disabled (including by Firefox 'Refresh' or 'Restarting with Add-ons Disabled'/Safe Mode) requires this. I'm sure this will be addressed soon because the development team has proven very responsive by email.