Except that this has an interesting failure mode: unless you're visiting the sites by hand you're presumably using some browser automation framework, with diffe

Except that this has an interesting failure mode: unless you're visiting the sites by hand you're presumably using some browser automation framework, with different implementations for different browsers. And _those_ can have nontrivial power usage, depending on how they work. I know for a fact some of them do power-hungry continuous polling...