Tested some more:
- Tried the Portable version, menus work OK, I can enable Browser Extensions fine. Unfortunately my browser extension complains that the Enpass version is too old.
- Stopped the program. Updated the configuration file by hand (~/.config/Sinew Software Systems/Enpass-Desktop.conf) and enabled the browser extensions by setting "EXTENSIONENABLED=true". After starting the program I tried my browser extension, it crashed the main app with a segfault.
WORKAROUND:
- Installed 5.4.1. Menus still not working as expected. However, after enabling the browser extensions manually by updating the configuration file the browser extension seems to work fine.
Please help me find a real solution.