Comment 1 for bug 1688178

The Webchat interface used on widelands.org is the webinterface from freenode with some pre-settings shown in an iframe. You could try using that webinterface directly: http://webchat.freenode.net/

This webinterface gives you some options for notifications like:

Beep on activity:
Emit HTML5 notifications on activity:
Flash titlebar when nick mentioned or on query activity:

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For some reason i couldn't open the options if our webchat interface is shown like it is. If i open the iframe in another tab the options could be opened.