Do you mean you need to set Firefox to "No proxy" or you need to prevent users from bypassing your proxy? If you need to lock certain settings in Firefox, please see these resources as a starting point: * http://kb.mozillazine.org/Locking_preferences * https://mike.kaply.com/2012/03/16/customizing-firefox-autoconfig-files/ To change your own proxy setting: * Windows: "3-bar" menu button (or Tools menu) > Options * Mac: "3-bar" menu button (or Firefox menu) > Preferences * Linux: "3-bar" menu button (or Edit menu) > Preferences * Any system: type or paste '''about:preferences''' into the address bar and press Enter/Return to load it In the search box at the top of the page, type ''proxy'' and Firefox should filter to the "Settings" button, which you can click. The default of "Use system proxy settings" piggybacks on your Windows/IE "LAN" setting. "Auto-detect" can lead to a flaky connection. You may want to try "No proxy".