Thanks @Kashish
I enabled logs, unfortunately they show very little. What I did to test was start with fresh run. Enpass and browsers work fine. Logging is enabled and I ran the command. I then suspended my computer and tried using the browser extensions. They of course failed. I then looked at the Enpass log again and ran the command again. (I tried this individually with Firefox and Chromium and both browsers at the same time, but the results from the command and log were the same, just merged together). Here are the results:
https://pastebin.com/1wT7XdHj
(Sorry had to make it external as every time I tried to post it was saying my post contained contact details)
As you can see from this screenshot, the Firefox and Chromium are listed in Browsers. I noted the "Browser extension failed" even though they worked fine. So I tried uninstalling the browser extensions, erased all Enpass data, uninstalled Enpass, rebooted, installed Enpass and went through setup and then installed the browser extensions and successfully authorised them. They worked fine. But upon suspending my computer, the same problem occurred. :(