Comment 7 for bug 1047588

Hi all, and sorry for the mess!
  This bug is caused by a change in the online-accounts-signon-ui, which is now more strict about the URLs it handles; in particular, all non-https URLs (such as "") are opened in the default browser.
At the same time, we updated the account plugins (source package is online-accounts-account-plugins) not to use that URL; however, all Online Accounts which you might have already created are not automatically updated to use the new settings.

The bug for tracking this is bug 1047191.


Delete all your accounts from Online Accounts (which is found in the System Settings), and re-create them. Don't worry, this won't cause any data loss.
Sorry again for the inconvenience!