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Re:Containers Come to Firefox Test Pilot by wodenokoto on Thursday March 02, 2017 @01:11PM (#13776560)
It's a simple UI version of Profiles.

The choice of container is no more or no less complicated than the choice of profile for links in external programs (or within Firefox)

Re:Containers Come to Firefox Test Pilot by groovecoder on Thursday March 02, 2017 @03:59PM (#13778150)
Just to be clear, this is NOT just a simple UI version of profiles. Containers only separate Cookies, localStorage, indexedDB, HTTP data cache, Image Cache (bug in progress), and other areas supported by originAttributes (See https://wiki.mozilla.org/Security/Contextual_Identity_Projec...)

I.e., Containers do NOT protect against some lower-level privacy vulnerabilities like plugin enumeration or history-sniffing that are mitigated more by using entirely separate profiles.