I submitted something very similar to YC last year with the same implementation. Works in practice but it's insecure. The solution I'm going with now is a nat

I submitted something very similar to YC last year with the same implementation. Works in practice but it's insecure. The solution I'm going with now is a native client that creates the cookies locally which the browser extension then accesses. Mine's also not immediately marketed towards teams but rather individuals. Best of luck.