5 ਤਾਰਿਆਂ ਵਿੱਚ 3 ਮਿਲੇ

When I click "install in Thunderbird" nothing happens
No error, but no add-on in the installed list as well

ਇਹ ਸਮੀਖਿਆ ਐਡ-ਆਨ (3.5.1) ਦੇ ਪਿਛਲੇ ਵਰਜਨ ਲਈ ਹੈ। 

That sounds like an addons site problem, but I can maybe help pin it down if you email me. Please raise issues via github, though, and not the ratings mechanism, I don't always see these.