islerfab

I solved my issue by installing the traditional Desktop application (not the one from the store), which is still version 5.6.0. I hope that helps you as well! Can be found here: https://www.enpass.io/download-enpass-for-windows/ (in the section "Download from Website")

+1 I'm having the same issue - other browsers work, it used to work on Firefox 56, but with Firefox 57 and the Add-On Enpass Password Manager 5.5.0.1 it always redirects to Enpass Connection Error.