UserAgent: Mozilla/5.0 (X11; CrOS x86_64 9765.85.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.123 Safari/537.36
Platform: 9765.85.0 (Official Build) stable-channel kip

Steps to reproduce the problem:
1. just ignore it and to close the tab
2. 
3. 

What is the expected behavior?
After the first pop up to go away 

What went wrong?
would not stop showing up every time i log on to my chromebook

WebStore page: chrome-extension://ecnphlgnajanjnkcmbpancdjoidceilk/content/web/viewer.html?source=extension_pdfhandler&file=&browser_action=true

Did this work before? No 

Chrome version: 61.0.3163.123  Channel: beta
OS Version: 9765.85.0
Flash Version: