Arc, a Mac-only internet browser from the aptly-named Browser Company, has just released a tool to let you tweak websites to your liking. That includes new colors and "zapping" elements of a page you don't want to see.
You'll still be able to use older builds of the browser on those operating systems, but you'll need a more recent version of Windows to keep getting feature and security updates.
DuckDuckGo's browser for Mac is still in beta, but it's now open for public testing. As you'd expect, it has built-in privacy-focused features, including a special YouTube player that prevents personalized ads.