There's still the potential for security problems, as the OP acknowledges: "It still has to go through our security review since just having an open socket can

There's still the potential for security problems, as the OP acknowledges: "It still has to go through our security review since just having an open socket can drive the browser is quite scary and an opportunistic hacker could just run a selenium script and steal details. It will probably be preferenced off to start but is still a potentially scary problem."