And it might cause some javascript not to be blocked. This is how to fix it:
CanvasBlocker:
Enable "Expert mode". Then scroll down and disable "Block data URL pages"
HTTPS Everywhere:
Don't block all unencrypted requests
It might conflict with other extensions that modifies CSP response header too. Don't know how to fix compatibility with other extensions.
Test if its working:
Go to a site like https://www.deviceinfo.me/
If it shows a ton of information (like mouse movement) its not working. If it shows very little (like IP Address, Country, Latitude & Longitude and just a few other things), its probably working.
More information:
https://github.com/ghacksuserjs/ghacks-user.js/issues/497#issuecomment-419880964
NAB wrote
please, do not use ublock, use uBlock origin. uBlock has had a sketchy past.