I'm so sad , i have used xnotifier for about 6 years . the latest update 4.0 is awful and disappointing , can't get it work with my 8 accounts and I keep refreshing many times until get all my accounts logging in . Now it takes 4 ever and age to login to all accounts . I'm searching for alternatives. Good bey my sweaty . It's now a web-based and not an actual add-one i think so.
Developer's note
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X-notifier 4.0 does not support user script because of the internal changes in Firefox.
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It's ffox decision 2 destroy the xnotifier