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Would be nice to have the option to switch tabs into offline mode, just like we can mute them.

You can do that with Chrome dev tools: Network -> No throttling -> Offline

Don't know how reliable this is though or whether a web developer could work around this.

It could be storing data and send it later when you visit the same origin from a different tab.

Unless you were also using incognito or throwaway tab containers to discard stored data.

Good point, thanks.