I have been running UbuntuMATE 16.04 on my Pi3 for a while and I have just run software updater to install recent updates. It updated Firefox to v50 and now Firefox will just sit there consuming 100% CPU and freezing the webpage. I have gone back to the original 16.04 image (no updates) which has Firefox v45 which runs fine.
Is it possible to ‘downgrade’ Firefox from v50 or do I need to rebuild from scratch and skip any Firefox updates when updating?