For me Opera died when they abandoned their own rendering engine Presto and moved to Chromium. UI was simplified greatly and many customization options disappea

For me Opera died when they abandoned their own rendering engine Presto and moved to Chromium. UI was simplified greatly and many customization options disappeared. Vivaldi is spiritual successor to classic Opera browser, still using Chromium, but has all possible customization options and additional tools, like RSS reader and email client.