Please see and continue with [/questions/1110672] Closing this as a duplicate. J99 I intend to full activate the sanboxing process for web-pages and addons process. I want to know if parameter 3 is how to strengthen the sandboxing process than 1 (default). String parameter "extensions.e10sBlockedByAddons;false" enable or disable sandbox for Addons? I'm contributor and volunteer to spread firefox... i need this informations , please...