Good defaults make programs easy. Bad defaults aggravate and waste your time. Spending your time fiddling with those defaults = more wasted time. Because Vivaldi’s keyboard shortcuts are too often interfering with keyboard shortcuts of other websites, I’m going to have to drop it as a web browser.
Maybe I’ll try it again in the future if they implement suites of keyboard-configurations so you can choose “Chromium” compatible or “Firefox” compatible. Trying to fix these as you experience the paper cuts in day-to-day use is not worth the trouble.
FastMail is still awesome though. You can nearly manipulate anything in FastMail with the keyboard.