It annoys me to no end when a web application prevents me from being able to paste content into an input field, or copy it out. If I paste an incorrect email address, that's my own fault. I use tools like 1Password to remember all kinds of things for me, and it's actually more error prone for me to type out all the characters than it is for me to copy from 1Password and paste into a text box.
This is a dead simple Google Chrome extension that removes copy and paste blocking.
