У вашего броузера проблема в совместимости с HTML5
After updating to mac os sierra i was having massive issues with Wifi access , i created this step by step method to resolve it.
1: turn off wifi , quit all applications that are using internet
2: Open Finder in mac OS x and pull down the “Go” menu and choose “Go To Folder” (or hit Command+Shift+G to get there quickly)
and put
/Library/Preferences/SystemConfiguration/
3: a. Locate and select the following files in the SystemConfiguration folder
1. com.apple.airport.preferences.plist.
2: com.apple.network.eapolclient.configuration.plist
3. com.apple.wifi.message-tracer.plist
4. NetworkInterfaces.plist
5. preferences.plist
4: Move these files to trash.
5: restart the mac.
6: open network settings in system preferences and follow the video.