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
Liked by Olle Linge, Michael Knight, sinosplice, Kai Carver, Mobolle, lisson, and Jennifer
20 October, 2022 20:46
There is also a slightly improved version called Zhongzhong: https://chrome.google.com/webstore/detail/zhongzhong-an-improved-ch/dggcgdjndddfmcfoipccicfoajmciacf?hl=en