Unsyncing
I attempted to "log in" to MY Firefox on a friends computer. It was set up in another language so didn't understand the prompts. Instead of simply logging in I SYNCED our accounts, because this is apparently the default login process. Now all of our saved details are shared. How do I UN-SYNC our accounts?
Wšykne wótegrona (1)
They can not be unsynced. You will need to manually do what needs doing.
May I suggest: http://portableapps.com/apps/internet/firefox_portable Mozilla Firefox, Portable Edition
https://portableapps.com/apps/internet/firefox-portable-esr Mozilla Firefox ESR, Portable Edition
A fully functional package of Firefox optimized for use on a USB key drive. A specialized launcher will allow most favorite extensions to work as you switch computers.
Firefox Portable is a 3rd-party build. Support is available here: http://portableapps.com/forums/support/firefox_portable
You can use sync to share data between profiles. But some data cannot be shared between different versions.