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!)

Vivaldi is a good Chrome replacement.

In the UK, and no idea until I found this site https://tvrdb.com which allows you to search old TV listings.

It was BBC1.

Got the Blu-ray a few years back. I think the BBC might have cut a few bits.

Don’t even need an app. I got an eSIM via a QR code (which went to a website where the eSIM was downloaded). This was on a Pixel 6. I guess the process may be different on other phones.