Opera used to be a fantastic web browser, with a custom high-performance Presto rendering engine and features like tabbed windows that didn't show up in competing browsers until years later. However, the modern Opera browser is a shadow of its former self, reliant on chasing trends and meme advertising to
My biggest attachment to Safari is how well integrated it is with the rest of the Mac. Fingerprint integration for passwords, gesture integration with the track pad, seamless handoff between phone and computer—these things are somewhat reproducible with Firefox and extensions, but it is nowhere near as perfect as it is when you’ve got the browser and the whole OS designed to work in a coordinated dance with each other.