There are several reasons why Facebook login pop-ups do not appear when you click on "Connect your Facebook account".
Most of the time, you just need to make sure that no Ad blocker like Goshtery, AdBlock Plus, or Poper Blocker,... can interfere with the process.
Example of AdBlock | 
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If you have already deactivated everything but the problem persists, consider checking directly on your browser if the pop-ups are not stopped.
If the problem persists, do not hesitate to contact our technical team and we will be happy to see what the problem is.