Omg what a load of rubbish. Firefox updated today to v57 Quantum..... Legacy add-ons and themes are not compatible anymore. So basically I lost just about all of my addons. Admittedly the latest version is a lot faster, but that doesn't help me really. The addons I use are there for a reason.... they all help in the work that I do online. Using the search feature to look for alternative addons is a waste of time.... hardly any there. (only 3 pages) These are the addons that I lost.... Have had to re-install V56 and have turned off automatic updates. I have a feeling that Firefox just made the biggest mistake ever.