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Some Tor w/ Firefox Questions

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Hey Tor Users,

I teach a workshop on privacy and anonymity and I've gotten some
questions that I didn't know how to answer. Maybe somebody can answer a
few of these.

1. If I have multiple Firefox profiles, one of which is exclusively for
Tor use, if I use another profile with javascript later on, is that a
threat to the data stored in the other profiles? Can add-ons see
information in other profiles?

2. If I'm doing my Tor browsing in one browser (say, Firefox) and open
up another one (say Ephiphany) that has javascript enabled, what risks
do I face? AFAIK javascript can see what's in your clipboard, which
would be bad if I'm using the clipboard with Torified content Is that it?

3. One of the common criticisms of NoScript+Tor is that a malicious exit
node can pretend to be any site it wishes. What about enabling js on
file:// urls? If I understand them correctly, the browser won't make any
external requests and then there would be no threat of an attack.

4. TorButton (wisely) disabled updates. Aside from the risk of an exit
node making you download it's own module, what other risks are there?
Does firefox submit any information that could identify you aside from
what plugins you use?

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