Google Plus Port is the first stop Port for migrating Google Plus users after or during, the initial Google Plus shutdown. Join in to meet other Google Plus users and help re-grow the Google Plus Spirit!
Since I had to go look up this stuff anyway. Here's a primer on opening up a JSON file in Chrome. (When you create a Google Takeout for G+ you have the option of downloading your data in HTML or JSON. JSON tends to be more useful).
There are many ways to open up these files. Chrome is just one way.