Each time I update firefox, it seems useful add-ons like adblockers etc suddently are no longer compatible. No warning, no "undo" option - just "this doesn't work anymore". There doesn't seem to be any way of working out how much damage each update causes - can you not give SOME guidance to help us work out whether we need to download - and for example if we need to export out password list with an add-on before you make sure it will never work again. Just think the odd "Update Info" with a little blurb about what is involved and what is likely to stop working would be very helpful. As it is, it seems that if you need to use add-ons, people are increasingly suggesting Chrome. Pity, I have been with FF for years - but it does seem other browsers don't seem to have the same amount of issues with add-ons suddenly failing after an update.