The plugin works perfectly, but as the warning says, a ton of sites hate anti-fingerprinting and will ruin your browsing experience when this plugin is enabled. Some will intentionally put you in an infinite redirection loop so you can't even access their site if you have CyDec enabled.
I don't mind, I will just stop using those sites then. The fact they hate anti-fingerprinting so much just proves it works and it is a very valuable tool in securing your privacy.
About a month ago, I attempted to use this application, and it worked 1 out of maybe 15 times - not very reliable. Test it again now after a new update, and it's working beautifully now. Thank you to the developer for this update and for the beautiful plugin. Keep up the amazing work.