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Re:Containers Come to Firefox Test Pilot by detaro on Thursday March 02, 2017 @03:30PM (#13777892)
There is a feature called First Party Isolation that (I think) does what you want for normal tabs, and can already be enabled through about:config. (initially developed for the Tor Browser Bundle, their description of it is here https://www.torproject.org/projects/torbrowser/design/#ident... )
Re:Containers Come to Firefox Test Pilot by Sammi on Thursday March 02, 2017 @04:57PM (#13778640)
Thanks for that. Found it and enabled it.

privacy.firstparty.isolate

Re:Containers Come to Firefox Test Pilot by cpeterso on Friday March 03, 2017 @01:02AM (#13781049)
Beware that privacy.firstparty.isolate might break some sites that depend on third-party services for login authentication or comment systems. If you find any broken sites, you can report them in Bugzilla and mention this Firefox bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1299996

Re:Containers Come to Firefox Test Pilot by kybernetikos on Friday March 03, 2017 @02:25AM (#13781288)
I use noscript to by default turn off scripts from 3rd party sites (unless whitelisted). It breaks quite a few sites, but it also makes lots of sites load quicker and doesn't load a bunch of advertising/tracking stuff that I don't really want loaded anyway.