Maybe use a PAC file and lock the connection settings in Firefox to use a PAC file.

• http://en.wikipedia.org/wiki/Proxy_auto-config

• http://kb.mozillazine.org/network.proxy.type

Use a mozilla.cfg file in the Firefox program folder to lock prefs or specify new (default) values.

Place a file local-settings.js in the defaults\pref folder where you also find the file channel-prefs.js to specify using mozilla.cfg.

pref("general.config.filename", "mozilla.cfg");

These functions can be used in the mozilla.cfg file:

defaultPref();  // set new default value
pref();         // set pref, but allow changes in current session
lockPref();     // lock pref, disallow changes

See:

• http://kb.mozillazine.org/Locking_preferences

I have a proxy server set up (Symantec.cloud). Fire fox is “locked” so users would find it difficult to bypass it.

I have a file: local-settings.js This is located in: C:\Program Files (x86)\Mozilla Firefox\defaults\pref The content of this file is:

pref("general.config.obscure_value", 0); // only needed if you do not want to obscure the content with ROT-13

pref("general.config.filename", "mozilla.cfg");

I also have the file: called: mozilla.cfg This is located: C:\Program Files (x86)\Mozilla Firefox The contents of this file is:

//

lockPref("network.proxy.type", 5);

All that is working fine, users can’t easily change the connection settings. So all that is good and works…

What I would also like to do is set firefox so access is limited to 1 IP address and nothing else is allowed (the whole internet is blocked, except this one IP address). You suggest using a PAC file - I was unsure how I would use a PAC file, (I have never written one) and do not understand how I would implement one? Please help.