It’s baseball season again, and there’s some good news for people who use MLB TV to watch out-of-market games on their Mac: This is the year that Major League Baseball has finally ditched Flash or Silverlight or whatever they were previously using for desktop streaming. This is nice, because it means I can use Safari (my preferred browser) rather than Chrome (which I keep around for sites that aren’t compatible with Safari or require Flash). But there’s a great side effect: It finally gives Macs the ability to do what iPads have been able to do for a couple of years, namely pop a baseball game into Picture in Picture mode, so it floats above other windows on your screen without any browser chrome getting in the way. […] Still, I was able to enable the Picture in Picture mode by using PiPifier, an app in the Mac App Store that adds a picture-in-picture button to the Safari toolbar.
You can grab the extension here. It works great.