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To reconfigure Tor Browser so you can access the local web interface, apply the following six steps.

TODO: Check with TBB series 7.0+ once it becomes stable. There are alpha series bug reports that it doesn't work https://forums.whonix.org/t/new-version-of-tbb-no-longer-accepts-foxyproxy-plugin/2565/32

Step One: Make the tbb-foxyproxy config file available to Tor Browser. [1] [2]


cp /usr/share/usability-misc/tbb-foxyproxy/foxyproxy.xml /home/user/.tb/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/

Step Two: Download and install the add-on:

Browser Settings -> Add-ons -> Search: "foxyproxy" -> Install: FoxyProxy Standard

This is safe to do since all add-ons on Mozilla's servers are now signed and verified by FireFox 43+.[3]

Step Three: Restart Tor Browser.

To reverse this and restore the default Tor Browser fingerprint its best to use a VM snapshot taken before installing the add-on. Re-downloading Tor Browser is another option in case no snapshot was taken. Alternatively FoxyProxy can be removed via about:addons -> Extensions menu.

Note: Tor Browser will soon ship with sandboxing on an opt-in basis. Unfortunately the initial sandbox versions are incompatible with such configurations and must not be enabled.[4]
  1. https://github.com/Whonix/usability-misc
  2. https://github.com/Whonix/usability-misc/blob/master/usr/share/usability-misc/tbb-foxyproxy/foxyproxy.xml
  3. https://wiki.mozilla.org/Add-ons/Extension_Signing
  4. https://lists.torproject.org/pipermail/tor-dev/2016-December/011733.html