Security researcher Warren He reported that when a page is transitioned into Reader Mode in Firefox for Android, the resulting page has chrome privileges and its content is not thoroughly sanitized. A successful attack requires user enabling of reader mode for a malicious page, which could then perform an attack similar to cross-site scripting (XSS) to gain the privileges allowed to Firefox on an Android device. This has been fixed by changing the Reader Mode page into an unprivileged page.
This vulnerability only affects Firefox for Android.
Vulmon