This update doesn't seem to remove any add-ons specifically but turns them off on more sensitive websites if Mozilla has not reviewed them.
It does look like there is an about:config option to turn it off, however it looks like this is most likely to be for bank websites etc. and only for add-ons not reviewed by Mozilla.
Currently, at least, ublock origin and most of the bigger adblock add-ons are reviewed by Mozilla and shouldn't be affected
This update doesn't seem to remove any add-ons specifically but turns them off on more sensitive websites if Mozilla has not reviewed them.
It does look like there is an about:config option to turn it off, however it looks like this is most likely to be for bank websites etc. and only for add-ons not reviewed by Mozilla.
Currently, at least, ublock origin and most of the bigger adblock add-ons are reviewed by Mozilla and shouldn't be affected