Internet Explorer:
1) First,
install Java.
2) Then search Java in your start menu and launch Configure Java. In the security tab, click Exception Site List and add the following sites.
- http://8bitmmo.net
- https://8bitmmo.net
- http://www.kongregate.com
- https://www.kongregate.com
- https://s3.amazonaws.com
Close the settings window with OK button.
3) Then restart Internet Explorer and reload this page (you MUST close all internet exporer windows and relaunch IE every time you modify Java settings for them to have any effect).
Firefox: No longer supports java web plugins.
Chrome: No longer supports java web plugins.
Edge: Does not support java web plugins.
Other: If needed, install Java. Then restart your browser.
Bonus Tip: If Java still doesn't work, uninstall ALL copies of Java from windows control panel, reboot, install latest java, and then run browser.