Have you heard about pihole for DNS blocking ? You m might have success when at home on wifi as this would greatly cut down on ads and trackers.
Otherwise, if you think Firefox is too slow to pirate (not sure I understand that, but ok) you can try another browser .. maybe try Brave? Ya, maybe some negative publicity lately, but I'm not sure it bothers me, or perhaps I don't understand what exactly they might be selling of my info..
I'm sure it's normal as brain plasticity takes time to reshape the neuron pathways and memory links. Give your brain and inner voice some time to get to know your new self and it will come.
Don't be so hard on yourself!
Cheers!