Browser : Google Chrome
How to enable the flash plug-in on the browser :
Copy and paste "chrome://settings/contentExceptions#plugins" into the URL bar to bring up the "Plug-in exceptions" dialog.
Add xat as an exception by typing "xat.com", "xatech.com" and "util.xat.com" into the text boxes.
Make sure the drop down menus are set to "Allow" and press enter or click "Finished" to save your changes.
The steps above may not be enough for some cases. If you're still having trouble after following these steps and restarting your browser, you may need to disable the "Prefer