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Experimental Firefox Feature Lets You Use Multiple Identities While Surfing the Web (techcrunch.com)
Firefox web browser has a new experimental feature that allows a user to segregate their online identities and sign in into multiple mail or social media accounts side-by-side without having to use multiple browsers. From a TechCrunch report: This new "container tab" feature, which is now available in the unstable Nightly Firefox release channel, provides you with four default identities (personal, work, shopping, and banking) with their own stores for cookies, IndexedDB data store, local storage and caches. In practice, this means you can surf Amazon without ads for products you may have looked at following you around the web when you switch over to your work persona. As the Firefox team notes, the idea behind this feature isn't new, but nobody has figured out how to best present this new tool to users.
uMatrix (replacement for Ghostery, AdBlock|uBlock, etc) - blocks by default:
All 3rd party cookies.
All 3rd party scripts.
All iFrames.
Why not just have a per-site identity? In other words, tracking cookies become worthless because they can't follow you from site to site.
You have, in effect, described EFF's Privacy Badger addon. It works heuristically to block cookies from leaking from their original domains, except when told otherwise (some exceptions are included by default -- so-called yellowlist, check out "How does Privacy Badger work?" section). I've been using it for some time and seems to work very well with little breakage. Rarely have to whitelist something.