What's in a name? Rated 3 out of 5 stars
Am using FF 9.0.1 and with WebMail Notifier 2.8.3 but made the mistake of upgrading to WMN 2.9. Now I can no longer access my gmail accounts of the format firstname.lastname@example.org. Add-on not particular: fails on computers with Win XP Home (SP 3) and Windows 7 Professional (64-bit).
Rolled back to v2.8.3 and everything works again. Hope to see this problem fixed in next upgrade.