Living in constant fear that a Google algorithm may someday decide to ban our extension without providing a reason, advance notice, or a meaningful appeals process. It feels like there's some new horror story describing this situation at least once a week here on HN.
Safari. Pretty much everything else you can test on any PC (macs included). And afaik only Chrome and Apple charge for publishing, and Chrome is cheaper.
Chrome charges? Then how do so many scam extensions end up on there?