hi daneklad, please refer to http://kb.mozillazine.org/Locking_preferences for a method to lock certain preferences when deploying firefox. in your particular instance, you'll want to set services.sync.enabled to false...

Hi,

Thanks for the quick reply....i have this all setup with regards to the config file etc...i had tried to input the services.sync.enabled to false, but when i launch firefox again, it still appears and gives me the option to sign in and sync a device....

can you check if the lock file really applies, by entering about:config into the firefox addressbar and seeing if "services.sync.enabled" is displayed in italics there and in a locked state?

I can confirm that it is applying as the "services.sync.enabled" is showing as a locked feature which i cant change in the browser

ok, so this might only apply to the old sync service in use until firefox 29. you could try locking these prefs as well:

lockPref("services.sync.serverURL", "");
lockPref("services.sync.engine.addons", false);
lockPref("services.sync.engine.bookmarks", false);
lockPref("services.sync.engine.history", false);
lockPref("services.sync.engine.passwords", false);
lockPref("services.sync.engine.prefs", false);
lockPref("services.sync.engine.tabs", false);

it will still be possible to sign up/login in the user interface then, but any real syncing should be made impossible then - please double-check that with a real account though...

Note that you can also run JavaScript with chrome privileges via mozilla.cfg, so you can consider to disable the about:accounts page.

• http://mike.kaply.com/2012/03/22/customizing-firefox-advanced-autoconfig-files/
• https://mike.kaply.com/cck2/

I have tried the cck2 to import the preferences but this does not work. It doesn't change any of the preferences specified....

I found that by going to about:config and double clicking on the entries I wished to lock, they would toggle to the desired state.

By logging in to Firefox on another machine, I was able to confirm that while logged in to the same account, I was unable to sync Firefox between the two machines: Adding favorites in one or the other did not sync, Remembering passwords did not sync between the machines.

As yet, I am not sure where this configuration information is maintained, as the contents of the mozilla.cfg file did not change.

Note that you can also set String prefs services.sync.*URL to an empty string value to prevent connecting to the Sync server via a lockPref() call.