From postmarketOS

Since there is no Tor-Browser in PostmarketOS you can setup a tor proxy

sudo apk add tor

sudo cp /etc/tor/torrc.sample /etc/tor/torrc

sudo service start tor

check if tor is running and on which port:

sudo netstat -tunlp | grep tor

in Firefox Network Settings Select:

 Manual proxy configuration
 SOCKS Host  Port 9050

Tick the Proxy DNS when using SOCKS v5

For autostart Tor on boot:

 sudo rc-update add tor default

You can now visit tor sites but this method might not give you 100% anonymity!