Do like Firefox and the changes since version 57. The container extension allows me to work efficiently as a developer. https://addons.mozilla.org/de/firefox/addon/multi-account-containers/ Also this browser is OpenSource which means a great deal to me and can't be said about Chrome and Safari.
My one star is of course not for the speed or design of this new version (I don't know if it's faster), but because what makes Firefox great is its extensions. With this new version, most of my beloved extensions are gone, and there are no good replacements for them. Sorry, but my extensions are more important than speed and design (BTW, the old design was more beautiful).