Here is a screenshot of Chrome with Developer Tools active. Since Chrome on a Mac force to use the system-selected language and I'm not an english speakers, I added an english translation (the purple words).
I can confirm this, sadly.I'm unable to reproduce this error with Chrome 59/60, Firefox 54, Edge 38, or IE11. Can't test with Safari since it's no longer developed for Windows.
I'm fairly certain this is an issue with your browsers being out of date. I'm not a Mac/OSX user so unfortunately I can't provide much support, but Chrome 49 and Firefox 48 and earlier have known issues with certain encryption ciphers for HTTP/2. If you can't install a version newer than that, it's because your OS is too old and most likely no longer supported.