Collected research

Turn Any Page Into A Greasemonkey Popup

ha.ckers.org web application security lab - Archive » Turn Any Page Into A Greasemonkey Popup

Greasemonkey decides a file is a user script from the URL ending in .user.js alone, so appending a ?x.user.js parameter to any page or image forces the install dialog, even when Greasemonkey is disabled. The file lands at a predictable temp path containing a truncated username, and any MIME type works.

Record

Document

ha.ckers.org web application security lab - Archive » Turn Any Page Into A Greasemonkey Popup

Published by

ha.ckers.org

Topic

Other

In the archive

• Collected in the 2007 research round

Tags

• browser-extension
• javascript
• abuse-of-functionality
• mime
• info-leak
• owasp-a04-2021
• owasp-a05-2021

This page is the archive's own catalogue record. The research is the work of ha.ckers.org, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 17 August 2026.