Dromaeo is made by Mozilla, the company in charge of Firefox. Dromaeo is named after Dromaeosaurus which means “fast lizard”.
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Pro Dromaeo uses tests from several different tools
Con There's no easy way to compare tests
Unfortunately, Dromaeo does not have an option to save your result in order to compare it to others. The only thing you can do is to bookmark your results and then compare them.