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There are a few particularly pernicious sites that I actually use who also monitor users activity everywhere online, mostly just Facebook, but every so often I'll log into a Google service.

I'll set up disjoint Firefox profiles for each such site and launch them with aliases or scripts, like facebook that accesses facebookcorewwwi.onion, or google that connects from tor to a vpn.

Ideally, these special profiles should fail to access sites not critical to their respective sites, i.e. if I click a facebook link to youtube then a tab opens with a 404 message and I manually copy the youtube URL to a Firefox instance with another profile.

Two questions:

  • Does Firefox share any information between profiles? Caching, Site data, etc.?
  • How would you go about ensuring a profile to only works on a specific site?

Any other considerations you can think of?

Arjan
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Jeff Burdges
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  • This might be a better question for Mozilla support: https://support.mozilla.org/en-US/questions/firefox or https://ask.mozilla.org/questions/ – Eric G Apr 06 '15 at 02:52
  • Isn't this exactly what [private browsing](https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history) is for? – DavidPostill Apr 06 '15 at 20:24
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    I don't know the current state, but Flash data was even shared between browsers [six years ago](http://superuser.com/questions/1627/how-to-automatically-remove-flash-history-privacy-trail-or-stop-flash-from-stor). Also, when using IPv6, [make sure you use privacy addressing](http://superuser.com/questions/243669/how-to-avoid-exposing-my-mac-address-when-using-ipv6). – Arjan Apr 06 '15 at 21:02

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Have you looked a Privoxy? http://www.privoxy.org/ It isn't integrated with Firefox but gives you very fine grained control of what traffic is allowed.

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    Answers that are basically a link to a resource are considered low quality, but you have the start of a good answer here. You could talk about proxies in general and offer privoxy as a specific option. – schroeder Apr 06 '15 at 17:09
  • Regardless of the "quality" you consider the answer, it is an approach that may solve the OP's issue. The link was provided as it has all of the information you are asking me to elaborate on. I posted the suggestion because it may be a solution the OP hadn't considered. –  Apr 06 '15 at 18:17
  • Link-only answers are a problem if the link goes stale. Can you pull out the relevant details from the link to add to your answer? I'm not disagreeing with your answer in general, just that the content is too "light". – schroeder Apr 06 '15 at 18:18
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    While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – RoraΖ Apr 06 '15 at 18:37