To be fair, rgb values are there, but enabling that option is something you would have to do.

Also if you do check the registration screen clicking "steal" or use the console command there steal(); on register.html is a valid option for registration and disabling the in page "ads" with the advanced option.

The main selling point of this extension is that it's not spyware, I'm not casing shade at the alternatives, but this is why it was created and what it does that the alternatives may or may not do. If you enjoy reviewing source code more than writing it, this extension isn't for you.