Bug while using firefox browser

Apart from payment, one like button per page. It has major three bugs as of i used.

1. Multiple times a single account holder can like or dislike a same post by log in and log out multiple times.
2. Like count in Firefox and Google Chrome doesn’t not match.
3. Click Like or Dislike button in firefox, after few second refresh page immediately count disappears (Even check at demo site https://www.blessingsfrombudapest.com/).