So? There is no way for the vast majority of users to read or understand the source for something like Firefox - to the point it may as well be closed source. Agreed of course plenty of security researchers will be examining the code which they can’t with Vivaldi - but presumably if that was a security advantage Firefox would have less vulnerabilities when compared to other browsers. (Actually would be interested to see if this is the case!)
As Biden, I’m not going to risk publicly having Trump killed. I’m getting a hitman