I used to work on the Opera browser. I quit when it got sold to China. Also wanted to do that, since most people as well as main Oslo HQ was fired from Poland a year earlier.

Opera was very much a not-dubious company. But that is what it has turned in to.

-- I use Firefox as my main work-browser, and have for a long time, and the last few years I've used Vivaldi as my main personal browser.

I find it easier to just have separate browsers rather than do anything more advanced for context. :)