Rated 3 out of 5 stars

Thanks Paolo for looking into this.
I installed the latest version 1.7.5.1 but it still didn't fix the problem.
I then went to about:config and changed the property of "extensions.profileswitcher.use_onbeforeunload" to false in all the profiles I have created and I can finally switch between them again.

Αυτή η αξιολόγηση γράφτηκε για παλιότερη έκδοση του πρόσθετου (1.7.5.1-signed).  Αυτός ο χρήστης έχει υποβάλει παλιότερη αξιολόγηση για το πρόσθετο.

Install the 1.7.6.1 when it will be approved by AMO and try to revert that preference to true, it should work as expected