Firefox Sync error message "invalid email"
I am trying to create a Sync Account. The very second I start to input my email I get the following error message "Invalid email account". I have cleared all history and cache.
Additional System Details
- User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
That message should disappear once you have finished typing the complete email address with the @mailserver part, so just ignore it and keep on typing.