Chrome was and unbelievably still is the most developer friendly. Our Opera extension has been languishing for 7 months for approval or a response to our emails (we gave up) and snooty FireFox put us through the ringer to get our extension (they call it an add-on) approved and more than 2 months. Chrome is amazing for developers. Maybe unless you are an adblocker. That might be the opportunity for MS Edge Chromium.