I have a subscription to ZenMate (that they wouldn't refund after auto-renewal) but I have to leave the add-on disabled because whenever I visit Facebook, Firefox Quantum uses 100% CPU and a lot of RAM. Contacted support and they couldn't help at all or suggest data I could provide to help them debug.
Note: This occurs with all other add-ons disabled! Only ZenMate is enabled.
Would you be able to share a list of add-ons you currently run with Firefox Quantum. A few users brought up the same issue and then it turns out the cause was actually another add-on they had in common after the FF update which wasn't related to ZenMate.
