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

Step one) Terminate Tor Browser if currently running.

Step two) Disable add-on signature check. [1] [2]

echo 'pref("xpinstall.signatures.required", false);' > /home/user/.tb/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/preferences/50_addons_unsigned_allow.js

Step three) Install FoxyProxy:

sudo apt-get install xul-ext-foxyproxy-standard

Step four) To access the proxy/local WebUI of the desired application, the FoxyProxy add-on and its configuration need to be made available to Tor Browser. Run:

ln -s /usr/share/xul-ext/foxyproxy-standard/ /home/user/.tb/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/extensions/foxyproxy@eric.h.jung

Step five) Make the tbb-foxyprox config file available to Tor Browser. [3] [4]

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

Step six) Restart Tor Browser.

To find out how to reverse this Tor Browser configuration and to restore Tor Browser's default fingerprint, please press expand on the right side.

Step undo)

rm /home/user/.tb/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/extensions/foxyproxy@eric.h.jung

rm /home/user/.tb/tor-browser/Browser/TorBrowser/Data/Browser/profile.default/preferences/50_addons_unsigned_allow.js

And restart Tor Browser.

Note: Tor Browser will soon ship with sandboxing as opt-in, unfortunately this feature's initial versions are incompatible with such configurations and must not be enabled.[5]
  1. This doesn't lower security too much - unless you install add-ons from unsafe sources. It is required because Tor Browser is based on a newer version of Firefox while the add-ons in Debian are "unsigned". They are signed and verified when apt-get downloads them, so this is safe, but they do not have the signature that Firefox's code is expecting. (It wouldn't make them safer anyhow.)
  2. https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct
  3. https://github.com/Whonix/usability-misc
  4. https://github.com/Whonix/usability-misc/blob/master/usr/share/usability-misc/tbb-foxyproxy/foxyproxy.xml
  5. https://lists.torproject.org/pipermail/tor-dev/2016-December/011733.html