Allowing the chrome.debugger API to run on file:// URLs in DevTools in Google Chrome prior to 69.0.3497.81 allowed an attacker who convinced a user to install a malicious extension to access files on the local file system without file access permission via a crafted Chrome Extension.
https://security.gentoo.org/glsa/201811-10
https://chromereleases.googleblog.com/2018/09/stable-channel-update-for-desktop.html