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It's a huge conflict of interest for an ads company to develop a browser, let alone the browser with...(checks notes)...77% market share.

This, but as a built-in browser feature, configurable per-site, and also for all the other potentially useful/creepy web APIs.

Both could work. The API could be permission based. E.g. without consent the app would always see itself as in focus.

So one could stub out https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibi... or fake it via an extension (there are actually some already that disable the API by injecting JS that always returns "visible", f.e. https://addons.mozilla.org/firefox/addon/disable-page-visibi...). Don't know if there are more.

But just use Chrome! Our website only works in Chrome. Everyone should just be using Chrome. What's wrong with a Chrome monoculture?

:)