PUBLIC MARKS with tags firefox & cookies

The feature is not enabled by default, as it's known to cause some login persistence problems. To enable it users have two options.

This add-on enables the First Party isolation pref.

Mozilla a silencieusement déployé la fonctionnalité First Party Isolation (FPI) empruntée à Tor, pour endiguer le profilage des régies publicitaires

Opt-out of behavioral tracking by 100+ companies, including Google, Microsoft and AOL. Preserve your preferences even when you clear cookies from your browser. Choose individual networks, all networks or networks with policy questions.

Google have just released a Firefox only extension that automatically synchronises your bookmarks, cookies and passwords between browsers on different machines. Sorry for the continued Google love, but this is awesome! I just recently rebuilt a couple of computers I work on and I had to go through the process of setting up Firefox on each one. This tool would have made that task a lot easier.