FEBE kindly told me there was an update tonight which I duly uploaded. After restarting my Firefox (I have the latest version 49.0.2 installed) to find that FEBE was disabled and had a message saying it was not compatible with 49.0.2?
I went back to the previous version via this ....http://softwarebychuck.com/febe/febe.html
and all was well.
Repeated the same just to be sure - clicked to see if there were any updates, updated FEBE, restarted and broken again so I rolled it back to the previous one once more.
Am wondering if this is a problem just affecting me or if it is a more generalised issue please?