Wouldn't the devs know if a malicious LoC had been built into the client and distributed to take master passwords from the browser? Idk much about browser exten

Wouldn't the devs know if a malicious LoC had been built into the client and distributed to take master passwords from the browser? Idk much about browser extensions, but I think they would have been able to figure out if something malicious went out to last pass clients, no?