Warn before executing bookmarklet
A bookmarklet is a bookmark stored in a web browser that contains JavaScript commands that add new features to the browser. They are stored as the URL of a bookmark in a web browser or as a hyperlink on a web page. Bookmarklets are usually small snippets of JavaScript executed when user clicks on them.
This is a security risk that has been exploited, see: https://krebsonsecurity.com/2023/05/discord-admins-hacked-by-malicious-bookmarks/
@ma1 suggested we add a warning before executing one.
Edited by ruihildt