Start9 Docs Misc Guides Configuring Firefox for Tor

Configuring Firefox for Tor¶

Open Firefox and enter about:config in the URL bar. Accept any warnings that appear
Search for dom.securecontext.allowlist_onions and set the value to true:
Go to the right-hand hamburger menu and select Settings:
Search for the term proxy in the search bar in the upper right and select Settings...:
Check the option labeled Use System Proxy Settings and the box labeled Proxy DNS when using SOCKS v5:
Click OK and restart Firefox
Test that Firefox can resolve .onion URLs by visiting Start9’s Tor website: http://privacy34kn4ez3y3nijweec6w4g54i3g54sdv7r5mr6soma3w4begyd.onion.

Download the Proxy Auto Config file to inform Firefox how to resolve .onion URLs. Click here to get the one offered by Start9. Save it somewhere you will not delete it, and remember where you save it. For example:
C:\Program Files\Tor Browser\proxy.pac
Open Firefox and enter about:config in the URL bar. Accept any warnings that appear
Search for dom.securecontext.allowlist_onions and set the value to true:
Go to the right-hand hamburger menu and select Settings:
Search for the term proxy in the search bar in the upper right and select Settings...:
Select Automatic proxy configuration URL and paste in the path to your PAC file from earlier, prefixed with file://. For example:
file://C:/Program Files/Tor Browser/proxy.pac
Check the box labeled Proxy DNS when using SOCKS v5:
Click OK and restart Firefox
Test that Firefox can resolve .onion URLs by visiting Start9’s Tor website: http://privacy34kn4ez3y3nijweec6w4g54i3g54sdv7r5mr6soma3w4begyd.onion.

Download the Proxy Auto Config file to inform Firefox how to resolve .onion URLs. You can get Start9’s standard file from a terminal, by using:
sudo wget -P ~/ https://start9.com/assets/proxy.pac
Open Firefox and enter about:config in the URL bar. Accept any warnings that appear
Search for dom.securecontext.allowlist_onions and set the value to true:
Determine the full path of proxy.pac, which we will use in step 9, by executing the following command in the terminal, and copying its output to your clipboard:
echo file://$HOME/proxy.pac
Go to the right-hand hamburger menu and select Settings:
Search for the term proxy in the search bar in the upper right and select Settings...:
Select Automatic proxy configuration URL and paste the output from the command you performed in step 6. Be aware, the triple /// is intentional, and your path will be different from the one below - namely, YOUR_LINUX_USERNAME will be your actual linux username:
file:///home/YOUR_LINUX_USERNAME/proxy.pac
Check the box labeled Proxy DNS when using SOCKS v5 in the image above
Click OK and restart Firefox
Test that Firefox can resolve .onion URLs by visiting Start9’s Tor website: http://privacy34kn4ez3y3nijweec6w4g54i3g54sdv7r5mr6soma3w4begyd.onion.

Download the Proxy Auto Config file to inform Firefox how to resolve .onion URLs. We have one hosted here
Open Firefox and enter about:config in the URL bar. Accept any warnings that appear
Search for dom.securecontext.allowlist_onions and set the value to true:

Search for network.proxy.autoconfig_url, and set the value to file:///storage/emulated/0/Download/proxy.pac. This is the default location of a the proxy.pac file downloaded in step 2, although your path may vary:

Search for network.http.referer.hideOnionsSource and set the value to true
(GrapheneOS users only): Head to Settings -> Apps -> Firefox Beta -> Permissions -> Photos and videos -> Configure Storage Scopes -> ADD FILE, then navigate to where you placed the proxy.pac file:

Restart Firefox
Test that Firefox can resolve .onion URLs by visiting Start9’s Tor website: http://privacy34kn4ez3y3nijweec6w4g54i3g54sdv7r5mr6soma3w4begyd.onion.