I don’t use Safari for development (maybe it’s time to start :thinking_face:). Today I discovered by accident that Safari also has a responsive design mode! This feature has been available for several years, and I have never seen it. 😮
You can active it using CONTROL + COMMAND + R shortcut.
Even though it’s nothing new, Safari is getting better and better. It is my primary browser, but I use Firefox all the time for web development.