5 ਤਾਰਿਆਂ ਵਿੱਚ 3 ਮਿਲੇ

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.

ਇਹ ਸਮੀਖਿਆ ਐਡ-ਆਨ (1.7.5.1-signed) ਦੇ ਪਿਛਲੇ ਵਰਜਨ ਲਈ ਹੈ। 

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

5 ਤਾਰਿਆਂ ਵਿੱਚ 4 ਮਿਲੇ

Worked fine for me until FF 45. If I am not mistaken the author is not supporting its development anymore. Anyone knows any alternatives?

ਇਹ ਸਮੀਖਿਆ ਐਡ-ਆਨ (1.7.5.1-signed) ਦੇ ਪਿਛਲੇ ਵਰਜਨ ਲਈ ਹੈ। 

This bug should be fixed in 1.7.6 version, released now.
A workaround is to set the preference "extensions.profileswitcher.use_onbeforeunload" to false, but I suggest to try before the new version.

I'm still supporting the development, because this extension is for Thunderbird too, of course when XPCOM/XUL will be dropped support for Firefox will end.