This stopped working after update. Now i have got to go search for an older version and turn off auto-update. Ugh.... :/

Edit: I suggest, that for now, everyone look at the version history for this addon, and select an older one, when you hover your mouse over an older version a +Add To Firefox button appears. Just did that and everything is fine now, hopefully this gets fixed.

Version history: https://addons.mozilla.org/en-US/firefox/addon/xnotifier/versions/

Be sure to turn auto-updates off as well...at least for now.