hi, you could try blocking loop.services.mozilla.com which is the server used for call setup...

Thanks, will look at blocking that URL.

You can also consider to lock some loop prefs.

//
lockPref("loop.enabled", false);
lockPref("loop.server", "");

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

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

pref("general.config.filename", "mozilla.cfg");
pref("general.config.obscure_value", 0);

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

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

See:

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

• http://mike.kaply.com/2012/03/16/customizing-firefox-autoconfig-files/
• http://mike.kaply.com/2014/01/08/can-firefox-do-this/

can something like this be use to disable hello locally?

Can you clarify about what you would try to achieve and to what reply you are referring?

If you would loop.server (https://loop.services.mozilla.com/v0) to an empty string then Firefox won't be able to access the server. This will work for all Firefox profiles that are started via the Firefox installation that has the mozilla.cfg file.

//
lockPref("loop.enabled", false);
lockPref("loop.server", "");