Know where you're going to before clicking on a link.
This extension has an option page that let you select which icons should be displayed.
Currently, it supports the indicators below:
* Windows: New window/tab
* Protocols: ftp://, mailto:, irc://, aim://, file://, magnet:
* Hosts: Link to Gmail
* Security: Going to a secured webpage, Leaving a secured webpage
* External: Leaving the website (has some limitations)
(The extension can support more file types. If you want one added, please request it here.)