Starting this season, ESPN no longer allows you to watch split screen of 4 videos at the same time unless you have an Apple TV device. But for someone with a very good PC and Google Fiber, I wasn't going to be satisfied with that answer.
I've finally figured out how to make it work using Firefox and a few addons. For the record, I use Chrome as my day-to-day browsing so I chose Firefox so that it wouldn't interfere.
As mentioned, I have Google Fiber and I have a very good PC so your mileage may vary. I also have two monitors side-by-side so I can browse on one while watching games on the other. You could do essentially the same with an HDMI cable and TV.
First of course install Mozilla Firefox:
https://www.mozilla.org/en-US/firefox/new/
Add the following addons:
Tile Tabs:
https://addons.mozilla.org/en-US/firefox...tile-tabs/
Scrollbar Auto Show/Hide:
https://addons.mozilla.org/en-US/firefox...o-showhide
Mute all inactive tabs:
https://addons.mozilla.org/en-US/firefox...tive-tabs/
Once you have all of those installed, you can open the 4 games you want to watch into separate tabs, then click the Tile Tabs button > New Layout > 4 Tabs. Press F11 to set the Firefox window to be fullscreen, that will hide the scroll bars. From there, the only thing you'll need to do is scroll down a hair in each window to center the video. You can switch the audio source by clicking somewhere in the splitscreen window (best in the black border around the video).
The nicest part is that you're now no longer limited to only ESPN videos.
After all of that, here are my results: