The brave browser is a pretty good option on iOS, it has a good Adblock and it has support for background audio (assuming you enable it in the browsers settings)

It is one of the only browsers on iOS that I know of that has support for both, meaning you can use it to listen to YouTube music with no ads and with the screen off.

And to think that I was so proud of my 10k stopwatch.

To be fair this one is not developed by Bethesda