Tor Browser Bundle
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Full user review
"Works well and more"
It is anonymous and so under the guise of such hidden services, one can probably surf uninhibited by snoops although who that is depends on other factors I imagine. I am no expert there. Integrates into Firefox.
Java script is said to be better off disabled as it is used by the various bad guys to attack unsuspecting net surfers. Plug-ins I am unclear on as some seem to either not work or it is recommended not to use add ons and such.