Firefox

Right, I think people forget that Opera used to be funded by a subscription. But they had to move away from it because it just didn't work. I think the golden age of Opera was shortly after they dropped that. And I dearly miss Opera as they were before they switched over to Chromium.

I think the history of early to mid Opera is the perfect example of actually wise and interesting and innovative software choices. They were in very early on things like browser extensions, and they had incredible innovations like Opera Unite, Opera Turbo, and all kinds of incredible customization. But I suppose in some ways they're also a chilling tale of what could happen, because I'm pretty sure they sold to a Chinese company, switched to developing on Chromium, and seem to have abandoned the ethos of innovating. I know that some of the original developers from Opera went on to create Vivaldi but that too is based on Chromium.