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This guide assumes you have completed setting up Tor. Please visit this section first before you proceed as it is required for Firefox to properly work with Tor.
about:config in the URL bar. Accept any warnings that may appear about accessing advanced settings.
dom.securecontext.whitelist_onions and set the value to
Click here to get the file and save the file somewhere you won’t delete it. Please remember the location you save the file in if you do not use our example location. For this example:
C:\Program Files\Tor Browser\proxy.pac
Terminal App on your Mac. You can find it in your list of Applications. In the terminal, enter:
brew install wget
wget -P /usr/local/etc/tor https://registry.start9labs.com/sys/proxy.pac
From a terminal, enter:
sudo wget -P /etc/tor https://registry.start9labs.com/sys/proxy.pac
Now open your Firefox web browser, and select options (Windows), or preferences (Mac/Linux):
Search for the term “proxy” in the search bar in the upper right, then select the button that says
Automatic proxy configuration URLand paste in the path to your PAC file from earlier, prefixed with
file://. For example:
file://C:/Program Files/Tor Browser/proxy.pac
Then, check the box labeled
Proxy DNS when using SOCKS v5:
OK and then restart Firefox for the changes to take effect.
You’re all set! You should now be able to navigate to
.onion URLs in Firefox. This means you can bookmark Cups Messenger, and use your Bitwarden Tor address in the Bitwarden Firefox Plugin.