"We reported found vulnerabilities to OPNsense maintainers and we really want to thank them for a great response. They handled the whole process very professionally, quickly prepared effective patches for many vulnerabilities and included them in the newest release - OPNsense 23.7 “Restless Roadrunner”. Also, they provided us with reasoning behind decision to not patch some of them right now."
i turst the tor browser because of the protocol it uses (the onion protocol), not because of the browser i use it with.
Even if mullvad is fully open-source and very transparent about it, i think it is not a good idea to use a browser and a vpn from the same vendor.
They have full access to your internet data, and they now (if you use this browser) full controll over the browser you use.