Something on Habré bypassed the necessary extension for Google Chrome, showing the number of unread messages in Google Wave. And here he is:

To use, you need the latest dev-version of your browser,
dev-channel .
At the request of the Google Wave Team, the check is performed not every minute, as the author wanted, but every 30, so as not to overload the Wave servers.
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To installDo not forget: in order for the extensions to be displayed in the bookmarks bar, you need to register the key
"--show-extensions-on-top" in the browser's shortcut.
A source