Okay, the error still remains and the last comment of the Enpass team to this topic was on February 9 ! Trust and reliability are the most important things with a software in which I store my sensitive login and even credit card data! Enpass does not make a trustworthy impression on me. I will uninstall Enpass of all my devices.
Same here, in every browser: "Enpass Connection Error Please start Enpass desktop app and make sure you have checked "Enable Browser Extension" in Enpass Preferences, before using Enpass Browser Extension." OSX 10.12.3 Firefox 51.0.1 Chrome 56.0.2924.87 Safari 10.0.3 "Enable Browser Extension" is checked.