How to disable Setting button in Tools - Options - Advanced - Network..i've read an article that solved this problem..but thats problem contains web adress that couldn't be opened..any other solution??? thanks before best regard

You can disable or remove that button, but that won't prevent users from making the changes on the about:config page directly.<br /> You can lock the related network.proxy prefs if you do not want users to change the connection settings. See: *http://kb.mozillazine.org/Locking_preferences * http://kb.mozillazine.org/network.proxy.type * http://kb.mozillazine.org/network.proxy.%28protocol%29 * http://kb.mozillazine.org/network.proxy.%28protocol%29_port