This is sadly a much more likely scenario

On Android just use Brave browser and turn on the setting to allow tabs to play media in the background. Opera does the same thing.

Not sure what iOS options there are.

It’s by far the best mobile browser that let’s you run tampermonkey and uBlock on Android and it’s not close. I haven’t found an add-on that let’s me run video/audio in the background, so until then Brave stays installed so that running YouTube with no ads and the phone locked is an option.

Aside from that, Firefox gives fantastic customization options, runs well, and is less vulnerable to attacks specifically because it has a smaller market share and it makes more sense to target Chromium based browsers.

“If you are racist, I will attack you with the North”