I have been using Firefox for several years but I decided now to migrate to Chrome for performance reassons.
This made me to migrate also all my addons/extensions and, of course, x-notifier was the first one that I intalled. But I noticed that doesnt work so well like it does on Firefox.
The reason is that Chrome
The reason is that Chrome allow only one login at a time.
If you open Outlook page in Chrome while X-notifier check mails, your page can be switched to other account.
This is a limitation of Chrome.