This is a tool that adds a pop-up dictionary to Chrome. I haven't compared it with Pera Pera in detail, but it looks good. It also has the added benefit of allowing you to add words directly to your Skritter account!
Zhongwen: A Chinese-English Popup Dictionary for Chrome
Submitted by Olle Linge on 18 June, 2014 04:35
Beginner Intermediate Advanced Reading Web Vocabulary Dictionary Tools-and-Apps